Merge branch 'master' into component-rewriter-work

# Conflicts:
#	common/src/main/java/com/viaversion/viaversion/protocols/v1_20_3to1_20_5/rewriter/ComponentRewriter1_20_5.java

.github/FUNDING.yml

@@ -1,2 +1,3 @@
 github: kennytv
 patreon: kennytv
+custom: ['https://florianmichael.de/donate']

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -21,10 +21,11 @@ body:
 
   - type: textarea
     attributes:
-      label: Console Error
+      label: Server/Client Error
       description: |
         If you encounter warnings/errors in your console, **paste them with https://mclo.gs/ and put the paste link here**.
         If the error is small/less than 10 lines, you may put it directly into this field.
+        **Important**: If you are kicked for `Network Protocol Error` or an encoder/decoder exception, please click the `Open Report Directory` button on your client and paste the newest disconnect file contents.
       value: |
         ```
         Put the mclo.gs link or text here.
@@ -51,7 +52,7 @@ body:
         List the steps on how we can reproduce the issue. Make sure we can easily understand what you mean with each step.
       placeholder: |
         Example:
-        1. Login with a 1.13.2 client
+        1. Login with a 1.21.3 client
         2. Place a sign
         3. The sign text is displayed wrong
     validations:

.gitignore

@@ -109,4 +109,7 @@ nb-configuration.xml
 .nb-gradle/
 
 ### MacOS ###
-.DS_Store
+.DS_Store
+
+### Run Folder (ViaProxy) ###
+common/run/

README.md

@@ -20,6 +20,13 @@ Supported Versions:
 
 **User Docs:** https://docs.viaversion.com/display/VIAVERSION/
 
+Snapshot support
+--------
+**ViaVersion will only be released a few days *after* a Minecraft update** unless the protocol changes of the update were trivial. If you want early-access, usually days or even weeks before the final release, you can subscribe to either:
+- [GitHub Sponsors](https://github.com/sponsors/kennytv/sponsorships?sponsor=kennytv&tier_id=385613&preview=false) (preferred option. Use the `/verify` command on this Discord after), or alternatively
+- [Patreon](https://www.patreon.com/kennytv/membership) (see the highest tier and make sure to link Patreon to your Discord account under Settings->Connections)
+  This also includes access to a private repository with the code, which will be pushed to the public repository after the given delay on a Minecraft update.
+
 Releases/Dev Builds
 --------
 You can find official releases in the following places:
@@ -91,8 +98,7 @@ Resources
 
 - **[Via Mappings Generator](https://github.com/ViaVersion/Mappings)**
 - **[Mojang mappings](https://minecraft.wiki/w/Obfuscation_map)** (Thank you, Mojang, very cool)
-- **[wiki.vg](https://wiki.vg)** (Used for historic information regarding packet structure, we also contribute back)
-- **[Burger](https://github.com/Pokechu22/Burger)** (See [PAaaS](https://github.com/Matsv/Paaas))
+- Previously: **[Burger](https://github.com/Pokechu22/Burger)** (see [PAaaS](https://github.com/Matsv/Paaas)) and **wiki.vg**
 
 License
 --------

api/build.gradle.kts

@@ -19,7 +19,9 @@ dependencies {
     api(libs.vianbt) {
         exclude("it.unimi.dsi", "fastutil")
     }
-    api(libs.gson)
+    api(libs.gson) {
+        exclude("com.google.errorprone", "error_prone_annotations")
+    }
     implementation(rootProject.libs.text) {
         exclude("com.google.code.gson", "gson")
         exclude("com.viaversion", "nbt")

api/src/main/java/com/viaversion/viaversion/api/data/FullMappings.java

@@ -53,6 +53,14 @@ public interface FullMappings extends BiMappings {
      */
     @Nullable String identifier(int id);
 
+    /**
+     * Returns the unmapped string identifier for the given mapped identifier.
+     *
+     * @param mappedIdentifier mapped identifier
+     * @return unmapped string identifier, or null if not found
+     */
+    @Nullable String identifier(String mappedIdentifier);
+
     /**
      * Returns the mapped string identifier for the given mapped id.
      *

api/src/main/java/com/viaversion/viaversion/api/data/FullMappingsBase.java

@@ -84,7 +84,18 @@ public class FullMappingsBase implements FullMappings {
     }
 
     @Override
-    public String mappedIdentifier(final int mappedId) {
+    public @Nullable String identifier(final String mappedIdentifier) {
+        final int mappedId = mappedId(mappedIdentifier);
+        if (mappedId == -1) {
+            return null;
+        }
+
+        final int id = mappings.inverse().getNewId(mappedId);
+        return id != -1 ? identifier(id) : null;
+    }
+
+    @Override
+    public @Nullable String mappedIdentifier(final int mappedId) {
         if (mappedId < 0 || mappedId >= mappedIdToString.length) {
             return null;
         }

api/src/main/java/com/viaversion/viaversion/api/data/MappingData.java

@@ -35,56 +35,82 @@ public interface MappingData {
     void load();
 
     /**
-     * Returns the mapped block state id, or -1 if unmapped.
+     * Returns the mapped block state id, or 0 if unmapped.
      *
      * @param id unmapped block state id
-     * @return mapped block state id, or -1 if unmapped
+     * @return mapped block state id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold block state mappings
      */
     int getNewBlockStateId(int id);
 
     /**
-     * Returns the mapped block id, or -1 if unmapped.
+     * Returns the mapped block id, or 0 if unmapped.
      *
      * @param id unmapped block id
-     * @return mapped block id, or -1 if unmapped
+     * @return mapped block id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold block mappings
      */
     int getNewBlockId(int id);
 
+    /**
+     * Returns the backwards mapped block id, or 1 if unmapped.
+     *
+     * @param id mapped block id
+     * @return backwards mapped block id, or 1 if unmapped
+     */
     int getOldBlockId(int id);
 
     /**
-     * Returns the mapped item id, or -1 if unmapped.
+     * Returns the mapped item id, or 0 if unmapped.
      *
      * @param id unmapped item id
-     * @return mapped item id, or -1 if unmapped
+     * @return mapped item id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold item mappings
      */
     int getNewItemId(int id);
 
     /**
-     * Returns the backwards mapped item id, or -1 if unmapped.
+     * Returns the backwards mapped item id, or 1 if unmapped.
      *
      * @param id mapped item id
-     * @return backwards mapped item id, or -1 if unmapped
+     * @return backwards mapped item id, or 1 if unmapped
      * @throws NullPointerException if this mappingdata does not hold item mappings
      */
     int getOldItemId(int id);
 
     /**
-     * Returns the mapped particle id, or -1 if unmapped.
+     * Returns the mapped particle id, or 0 if unmapped.
      *
      * @param id unmapped particle id
-     * @return mapped particle id, or -1 if unmapped
+     * @return mapped particle id, or 0 if unmapped
      * @throws NullPointerException if this mappingdata does not hold particle mappings
      */
     int getNewParticleId(int id);
 
+    /**
+     * Returns the mapped attribute id, or 0 if unmapped.
+     *
+     * @param id unmapped attribute id
+     * @return mapped attribute id, or 0 if unmapped
+     * @throws NullPointerException if this mappingdata does not hold attribute mappings
+     */
     int getNewAttributeId(int id);
 
+    /**
+     * Returns the mapped sound id, or 0 if unmapped.
+     *
+     * @param id unmapped sound id
+     * @return mapped sound id, or 0 if unmapped
+     * @throws NullPointerException if this mappingdata does not hold sound mappings
+     */
     int getNewSoundId(int id);
 
+    /**
+     * Returns the backwards mapped sound id, or 1 if unmapped.
+     *
+     * @param i mapped sound id
+     * @return backwards mapped sound id, or 1 if unmapped
+     */
     int getOldSoundId(int i);
 
     /**
@@ -126,10 +152,10 @@ public interface MappingData {
 
     @Nullable Mappings getEnchantmentMappings();
 
-    @Nullable Mappings getAttributeMappings();
-
     @Nullable Mappings getPaintingMappings();
 
+    @Nullable FullMappings getAttributeMappings();
+
     @Nullable FullMappings getEntityMappings();
 
     @Nullable FullMappings getArgumentTypeMappings();

api/src/main/java/com/viaversion/viaversion/api/data/MappingDataBase.java

@@ -43,10 +43,10 @@ public class MappingDataBase implements MappingData {
     protected FullMappings entityMappings;
     protected FullMappings recipeSerializerMappings;
     protected FullMappings itemDataSerializerMappings;
+    protected FullMappings attributeMappings;
     protected ParticleMappings particleMappings;
     protected BiMappings itemMappings;
     protected BiMappings blockMappings;
-    protected BiMappings attributeMappings;
     protected Mappings blockStateMappings;
     protected Mappings blockEntityMappings;
     protected Mappings soundMappings;
@@ -76,8 +76,6 @@ public class MappingDataBase implements MappingData {
         menuMappings = loadMappings(data, "menus");
         enchantmentMappings = loadMappings(data, "enchantments");
         paintingMappings = loadMappings(data, "paintings");
-        attributeMappings = loadBiMappings(data, "attributes");
-
 
         final CompoundTag unmappedIdentifierData = readUnmappedIdentifiersFile("identifiers-" + unmappedVersion + ".nbt");
         final CompoundTag mappedIdentifierData = readMappedIdentifiersFile("identifiers-" + mappedVersion + ".nbt");
@@ -87,6 +85,7 @@ public class MappingDataBase implements MappingData {
             argumentTypeMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "argumenttypes");
             recipeSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "recipe_serializers");
             itemDataSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "data_component_type");
+            attributeMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "attributes");
 
             final List<String> unmappedParticles = identifiersFromGlobalIds(unmappedIdentifierData, "particles");
             final List<String> mappedParticles = identifiersFromGlobalIds(mappedIdentifierData, "particles");
@@ -180,7 +179,7 @@ public class MappingDataBase implements MappingData {
 
     @Override
     public int getOldBlockId(final int id) {
-        return blockMappings.getNewIdOrDefault(id, 1);
+        return blockMappings.inverse().getNewIdOrDefault(id, 1);
     }
 
     @Override
@@ -272,7 +271,7 @@ public class MappingDataBase implements MappingData {
     }
 
     @Override
-    public @Nullable Mappings getAttributeMappings() {
+    public @Nullable FullMappings getAttributeMappings() {
         return attributeMappings;
     }
 

api/src/main/java/com/viaversion/viaversion/api/data/ParticleMappings.java

@@ -36,6 +36,7 @@ public class ParticleMappings extends FullMappingsBase {
         addBlockParticle("falling_dust");
         addBlockParticle("block_marker");
         addBlockParticle("dust_pillar");
+        addBlockParticle("block_crumble");
         addItemParticle("item");
     }
 

api/src/main/java/com/viaversion/viaversion/api/debug/DebugHandler.java

@@ -78,7 +78,7 @@ public interface DebugHandler {
 
     /**
      * Returns whether packets should be logged after being transformed.
-     * Set to true by default.
+     * Set to false by default.
      *
      * @return whether packets should be logged after being transformed
      */

api/src/main/java/com/viaversion/viaversion/api/minecraft/BlockPosition.java

@@ -37,6 +37,13 @@ public class BlockPosition {
         return new BlockPosition(x + face.modX(), y + face.modY(), z + face.modZ());
     }
 
+    public double distanceFromCenterSquared(final double x, final double y, final double z) {
+        final double dx = this.x + 0.5 - x;
+        final double dy = this.y + 0.5 - y;
+        final double dz = this.z + 0.5 - z;
+        return dx * dx + dy * dy + dz * dz;
+    }
+
     public int x() {
         return x;
     }

api/src/main/java/com/viaversion/viaversion/api/minecraft/ChunkPosition.java

@@ -66,6 +66,17 @@ public final class ChunkPosition {
         return (long) chunkX & 0xffffffffL | ((long) chunkZ & 0xffffffffL) << 32;
     }
 
+    /**
+     * Returns a long key for the given block coordinates.
+     *
+     * @param x the block X coordinate
+     * @param z the block Z coordinate
+     * @return the chunk key
+     */
+    public static long chunkKeyForBlock(final int x, final int z) {
+        return chunkKey(x >> 4, z >> 4);
+    }
+
     @Override
     public boolean equals(final Object o) {
         if (this == o) return true;

api/src/main/java/com/viaversion/viaversion/api/minecraft/Holder.java

@@ -35,7 +35,7 @@ public interface Holder<T> {
      * @throws IllegalArgumentException if the id is negative
      */
     static <T> Holder<T> of(final int id) {
-        return new HolderImpl<>(id);
+        return new IdHolder<>(id);
     }
 
     /**
@@ -46,7 +46,7 @@ public interface Holder<T> {
      * @return a new direct holder
      */
     static <T> Holder<T> of(final T value) {
-        return new HolderImpl<>(value);
+        return new ValueHolder<>(value);
     }
 
     /**

api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSet.java

@@ -36,7 +36,7 @@ public interface HolderSet {
      * @return a new holder set
      */
     static HolderSet of(final String tagKey) {
-        return new HolderSetImpl(tagKey);
+        return new HolderSetImpl.Tag(tagKey);
     }
 
     /**
@@ -46,7 +46,7 @@ public interface HolderSet {
      * @return a new holder set
      */
     static HolderSet of(final int[] ids) {
-        return new HolderSetImpl(ids);
+        return new HolderSetImpl.Ids(ids);
     }
 
     /**

api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSetImpl.java

@@ -22,50 +22,63 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-import com.viaversion.viaversion.util.EitherImpl;
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+import java.util.Arrays;
 
-final class HolderSetImpl extends EitherImpl<String, int[]> implements HolderSet {
+final class HolderSetImpl {
 
-    HolderSetImpl(final String tagKey) {
-        super(tagKey, null);
-    }
+    record Tag(String tagKey) implements HolderSet {
+        @Override
+        public boolean hasTagKey() {
+            return true;
+        }
 
-    HolderSetImpl(final int[] ids) {
-        super(null, ids);
-    }
+        @Override
+        public int[] ids() {
+            throw new IllegalArgumentException("This holder set has a tag key");
+        }
 
-    @Override
-    public String tagKey() {
-        return left();
-    }
+        @Override
+        public boolean hasIds() {
+            return false;
+        }
 
-    @Override
-    public boolean hasTagKey() {
-        return isLeft();
-    }
-
-    @Override
-    public int[] ids() {
-        return right();
-    }
-
-    @Override
-    public boolean hasIds() {
-        return isRight();
-    }
-
-    @Override
-    public HolderSet rewrite(final Int2IntFunction idRewriter) {
-        if (hasTagKey()) {
+        @Override
+        public HolderSet rewrite(final Int2IntFunction idRewriter) {
             return this;
         }
+    }
 
-        final int[] ids = ids();
-        final int[] mappedIds = new int[ids.length];
-        for (int i = 0; i < mappedIds.length; i++) {
-            mappedIds[i] = idRewriter.applyAsInt(ids[i]);
+    record Ids(int[] ids) implements HolderSet {
+        @Override
+        public boolean hasTagKey() {
+            return false;
+        }
+
+        @Override
+        public String tagKey() {
+            throw new IllegalArgumentException("This holder set has direct ids");
+        }
+
+        @Override
+        public boolean hasIds() {
+            return true;
+        }
+
+        @Override
+        public HolderSet rewrite(final Int2IntFunction idRewriter) {
+            final int[] mappedIds = new int[ids.length];
+            for (int i = 0; i < mappedIds.length; i++) {
+                mappedIds[i] = idRewriter.applyAsInt(ids[i]);
+            }
+            return new Ids(mappedIds);
+        }
+
+        @Override
+        public String toString() {
+            return "Ids{" +
+                "ids=" + Arrays.toString(ids) +
+                '}';
         }
-        return new HolderSetImpl(mappedIds);
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/IdHolder.java

@@ -25,49 +25,29 @@ package com.viaversion.viaversion.api.minecraft;
 import com.google.common.base.Preconditions;
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
 
-final class HolderImpl<T> implements Holder<T> {
+record IdHolder<T>(int id) implements Holder<T> {
 
-    private final T value;
-    private final int id;
-
-    HolderImpl(final int id) {
+    IdHolder {
         Preconditions.checkArgument(id >= 0, "id cannot be negative");
-        this.value = null;
-        this.id = id;
-    }
-
-    HolderImpl(final T value) {
-        this.value = value;
-        this.id = -1;
     }
 
     @Override
     public boolean isDirect() {
-        return id == -1;
+        return false;
     }
 
     @Override
     public boolean hasId() {
-        return id != -1;
+        return true;
     }
 
     @Override
     public T value() {
-        Preconditions.checkArgument(isDirect(), "Holder is not direct");
-        return value;
-    }
-
-    @Override
-    public int id() {
-        return id;
+        throw new IllegalArgumentException("Holder is not direct");
     }
 
     @Override
     public Holder<T> updateId(final Int2IntFunction rewriteFunction) {
-        if (isDirect()) {
-            return this;
-        }
-
         final int rewrittenId = rewriteFunction.applyAsInt(id);
         if (rewrittenId == id) {
             return this;
@@ -77,12 +57,4 @@ final class HolderImpl<T> implements Holder<T> {
         }
         return Holder.of(rewrittenId);
     }
-
-    @Override
-    public String toString() {
-        return "HolderImpl{" +
-            "value=" + value +
-            ", id=" + id +
-            '}';
-    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/PaintingVariant.java

@@ -22,13 +22,19 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
+import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.HolderType;
 import io.netty.buffer.ByteBuf;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
-public record PaintingVariant(int width, int height, String assetId) {
+public record PaintingVariant(int width, int height, String assetId, @Nullable Tag title, @Nullable Tag author) {
 
-    public static HolderType<PaintingVariant> TYPE = new HolderType<>() {
+    public PaintingVariant(final int width, final int height, final String assetId) {
+        this(width, height, assetId, null, null);
+    }
+
+    public static HolderType<PaintingVariant> TYPE1_21 = new HolderType<>() {
         @Override
         public PaintingVariant readDirect(final ByteBuf buffer) {
             final int width = Types.VAR_INT.readPrimitive(buffer);
@@ -44,4 +50,24 @@ public record PaintingVariant(int width, int height, String assetId) {
             Types.STRING.write(buffer, variant.assetId());
         }
     };
+    public static HolderType<PaintingVariant> TYPE1_21_2 = new HolderType<>() {
+        @Override
+        public PaintingVariant readDirect(final ByteBuf buffer) {
+            final int width = Types.VAR_INT.readPrimitive(buffer);
+            final int height = Types.VAR_INT.readPrimitive(buffer);
+            final String assetId = Types.STRING.read(buffer);
+            final Tag title = Types.OPTIONAL_TAG.read(buffer);
+            final Tag author = Types.OPTIONAL_TAG.read(buffer);
+            return new PaintingVariant(width, height, assetId, title, author);
+        }
+
+        @Override
+        public void writeDirect(final ByteBuf buffer, final PaintingVariant variant) {
+            Types.VAR_INT.writePrimitive(buffer, variant.width());
+            Types.VAR_INT.writePrimitive(buffer, variant.height());
+            Types.STRING.write(buffer, variant.assetId());
+            Types.OPTIONAL_TAG.write(buffer, variant.title());
+            Types.OPTIONAL_TAG.write(buffer, variant.author());
+        }
+    };
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/RegistryEntry.java

@@ -36,4 +36,8 @@ public record RegistryEntry(String key, @Nullable Tag tag) {
     public RegistryEntry withKey(final String key) {
         return new RegistryEntry(key, tag != null ? tag.copy() : null);
     }
+
+    public RegistryEntry copy() {
+        return new RegistryEntry(key, tag != null ? tag.copy() : null);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/ValueHolder.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft;
+
+import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+
+record ValueHolder<T>(T value) implements Holder<T> {
+
+    @Override
+    public boolean isDirect() {
+        return true;
+    }
+
+    @Override
+    public boolean hasId() {
+        return false;
+    }
+
+    @Override
+    public int id() {
+        return -1;
+    }
+
+    @Override
+    public Holder<T> updateId(final Int2IntFunction rewriteFunction) {
+        return this;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSectionImpl.java

@@ -37,14 +37,14 @@ public class ChunkSectionImpl implements ChunkSection {
     public ChunkSectionImpl(final boolean holdsLight) {
         addPalette(PaletteType.BLOCKS, new DataPaletteImpl(ChunkSection.SIZE));
         if (holdsLight) {
-            this.light = new ChunkSectionLightImpl();
+            this.light = ChunkSectionLightImpl.createWithBlockLight();
         }
     }
 
     public ChunkSectionImpl(final boolean holdsLight, final int expectedPaletteLength) {
         addPalette(PaletteType.BLOCKS, new DataPaletteImpl(ChunkSection.SIZE, expectedPaletteLength));
         if (holdsLight) {
-            this.light = new ChunkSectionLightImpl();
+            this.light = ChunkSectionLightImpl.createWithBlockLight();
         }
     }
 

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSectionLight.java

@@ -35,7 +35,7 @@ public interface ChunkSectionLight {
     /**
      * Returns whether the section has sky light.
      *
-     * @return true if skylight is present
+     * @return true if sky light is present
      */
     boolean hasSkyLight();
 
@@ -43,7 +43,7 @@ public interface ChunkSectionLight {
      * Returns whether the section has block light.
      * This returns true unless specifically set to null.
      *
-     * @return true if skylight is present
+     * @return true if block light is present
      */
     boolean hasBlockLight();
 

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSectionLightImpl.java

@@ -30,9 +30,17 @@ public class ChunkSectionLightImpl implements ChunkSectionLight {
     private NibbleArray blockLight;
     private NibbleArray skyLight;
 
-    public ChunkSectionLightImpl() {
-        // Block light is always written
-        this.blockLight = new NibbleArray(ChunkSection.SIZE);
+    protected ChunkSectionLightImpl() {
+    }
+
+    public static ChunkSectionLight createWithBlockLight() {
+        final ChunkSectionLightImpl light = new ChunkSectionLightImpl();
+        light.blockLight = new NibbleArray(ChunkSection.SIZE);
+        return light;
+    }
+
+    public static ChunkSectionLight createEmpty() {
+        return new ChunkSectionLightImpl();
     }
 
     @Override

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataKey.java

@@ -26,6 +26,7 @@ import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.minecraft.GameProfile;
 import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.HolderSet;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.minecraft.item.data.AdventureModePredicate;
 import com.viaversion.viaversion.api.minecraft.item.data.ArmorTrim;
@@ -34,13 +35,20 @@ import com.viaversion.viaversion.api.minecraft.item.data.AttributeModifiers1_21;
 import com.viaversion.viaversion.api.minecraft.item.data.BannerPatternLayer;
 import com.viaversion.viaversion.api.minecraft.item.data.Bee;
 import com.viaversion.viaversion.api.minecraft.item.data.BlockStateProperties;
+import com.viaversion.viaversion.api.minecraft.item.data.Consumable1_21_2;
+import com.viaversion.viaversion.api.minecraft.item.data.CustomModelData1_21_4;
+import com.viaversion.viaversion.api.minecraft.item.data.DamageResistant;
+import com.viaversion.viaversion.api.minecraft.item.data.DeathProtection;
 import com.viaversion.viaversion.api.minecraft.item.data.DyedColor;
 import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
+import com.viaversion.viaversion.api.minecraft.item.data.Equippable;
 import com.viaversion.viaversion.api.minecraft.item.data.FilterableString;
 import com.viaversion.viaversion.api.minecraft.item.data.FireworkExplosion;
 import com.viaversion.viaversion.api.minecraft.item.data.Fireworks;
-import com.viaversion.viaversion.api.minecraft.item.data.FoodProperties;
-import com.viaversion.viaversion.api.minecraft.item.data.Instrument;
+import com.viaversion.viaversion.api.minecraft.item.data.FoodProperties1_20_5;
+import com.viaversion.viaversion.api.minecraft.item.data.FoodProperties1_21_2;
+import com.viaversion.viaversion.api.minecraft.item.data.Instrument1_20_5;
+import com.viaversion.viaversion.api.minecraft.item.data.Instrument1_21_2;
 import com.viaversion.viaversion.api.minecraft.item.data.JukeboxPlayable;
 import com.viaversion.viaversion.api.minecraft.item.data.LodestoneTracker;
 import com.viaversion.viaversion.api.minecraft.item.data.PotDecorations;
@@ -48,11 +56,15 @@ import com.viaversion.viaversion.api.minecraft.item.data.PotionContents;
 import com.viaversion.viaversion.api.minecraft.item.data.SuspiciousStewEffect;
 import com.viaversion.viaversion.api.minecraft.item.data.ToolProperties;
 import com.viaversion.viaversion.api.minecraft.item.data.Unbreakable;
+import com.viaversion.viaversion.api.minecraft.item.data.UseCooldown;
 import com.viaversion.viaversion.api.minecraft.item.data.WrittenBook;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.ArrayType;
 import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
 import com.viaversion.viaversion.api.type.types.version.Types1_21;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_2;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
 import com.viaversion.viaversion.util.Unit;
 
 public record StructuredDataKey<T>(String identifier, Type<T> type) {
@@ -64,24 +76,38 @@ public record StructuredDataKey<T>(String identifier, Type<T> type) {
     public static final StructuredDataKey<Unbreakable> UNBREAKABLE = new StructuredDataKey<>("unbreakable", Unbreakable.TYPE);
     public static final StructuredDataKey<Tag> CUSTOM_NAME = new StructuredDataKey<>("custom_name", Types.TAG);
     public static final StructuredDataKey<Tag> ITEM_NAME = new StructuredDataKey<>("item_name", Types.TAG);
-    public static final StructuredDataKey<Tag[]> LORE = new StructuredDataKey<>("lore", Types.TAG_ARRAY);
+    public static final StructuredDataKey<String> ITEM_MODEL = new StructuredDataKey<>("item_model", Types.STRING);
+    public static final StructuredDataKey<Tag[]> LORE = new StructuredDataKey<>("lore", new ArrayType<>(Types.TAG, 256));
     public static final StructuredDataKey<Integer> RARITY = new StructuredDataKey<>("rarity", Types.VAR_INT);
     public static final StructuredDataKey<Enchantments> ENCHANTMENTS = new StructuredDataKey<>("enchantments", Enchantments.TYPE);
     public static final StructuredDataKey<AdventureModePredicate> CAN_PLACE_ON = new StructuredDataKey<>("can_place_on", AdventureModePredicate.TYPE);
     public static final StructuredDataKey<AdventureModePredicate> CAN_BREAK = new StructuredDataKey<>("can_break", AdventureModePredicate.TYPE);
     public static final StructuredDataKey<AttributeModifiers1_20_5> ATTRIBUTE_MODIFIERS1_20_5 = new StructuredDataKey<>("attribute_modifiers", AttributeModifiers1_20_5.TYPE);
     public static final StructuredDataKey<AttributeModifiers1_21> ATTRIBUTE_MODIFIERS1_21 = new StructuredDataKey<>("attribute_modifiers", AttributeModifiers1_21.TYPE);
-    public static final StructuredDataKey<Integer> CUSTOM_MODEL_DATA = new StructuredDataKey<>("custom_model_data", Types.VAR_INT);
+    public static final StructuredDataKey<Integer> CUSTOM_MODEL_DATA1_20_5 = new StructuredDataKey<>("custom_model_data", Types.VAR_INT);
+    public static final StructuredDataKey<CustomModelData1_21_4> CUSTOM_MODEL_DATA1_21_4 = new StructuredDataKey<>("custom_model_data", CustomModelData1_21_4.TYPE);
     public static final StructuredDataKey<Unit> HIDE_ADDITIONAL_TOOLTIP = new StructuredDataKey<>("hide_additional_tooltip", Types.EMPTY);
     public static final StructuredDataKey<Unit> HIDE_TOOLTIP = new StructuredDataKey<>("hide_tooltip", Types.EMPTY);
     public static final StructuredDataKey<Integer> REPAIR_COST = new StructuredDataKey<>("repair_cost", Types.VAR_INT);
     public static final StructuredDataKey<Unit> CREATIVE_SLOT_LOCK = new StructuredDataKey<>("creative_slot_lock", Types.EMPTY);
     public static final StructuredDataKey<Boolean> ENCHANTMENT_GLINT_OVERRIDE = new StructuredDataKey<>("enchantment_glint_override", Types.BOOLEAN);
     public static final StructuredDataKey<Tag> INTANGIBLE_PROJECTILE = new StructuredDataKey<>("intangible_projectile", Types.TAG); // Doesn't actually hold data
-    public static final StructuredDataKey<FoodProperties> FOOD1_20_5 = new StructuredDataKey<>("food", FoodProperties.TYPE1_20_5);
-    public static final StructuredDataKey<FoodProperties> FOOD1_21 = new StructuredDataKey<>("food", FoodProperties.TYPE1_21);
+    public static final StructuredDataKey<FoodProperties1_20_5> FOOD1_20_5 = new StructuredDataKey<>("food", FoodProperties1_20_5.TYPE1_20_5);
+    public static final StructuredDataKey<FoodProperties1_20_5> FOOD1_21 = new StructuredDataKey<>("food", FoodProperties1_20_5.TYPE1_21);
+    public static final StructuredDataKey<FoodProperties1_21_2> FOOD1_21_2 = new StructuredDataKey<>("food", FoodProperties1_21_2.TYPE);
+    public static final StructuredDataKey<Consumable1_21_2> CONSUMABLE1_21_2 = new StructuredDataKey<>("consumable", Consumable1_21_2.TYPE);
+    public static final StructuredDataKey<Item> USE_REMAINDER1_21_2 = new StructuredDataKey<>("use_remainder", Types1_21_2.ITEM);
+    public static final StructuredDataKey<Item> USE_REMAINDER1_21_4 = new StructuredDataKey<>("use_remainder", Types1_21_4.ITEM);
+    public static final StructuredDataKey<UseCooldown> USE_COOLDOWN = new StructuredDataKey<>("use_cooldown", UseCooldown.TYPE);
     public static final StructuredDataKey<Unit> FIRE_RESISTANT = new StructuredDataKey<>("fire_resistant", Types.EMPTY);
+    public static final StructuredDataKey<DamageResistant> DAMAGE_RESISTANT = new StructuredDataKey<>("damage_resistant", DamageResistant.TYPE);
     public static final StructuredDataKey<ToolProperties> TOOL = new StructuredDataKey<>("tool", ToolProperties.TYPE);
+    public static final StructuredDataKey<Integer> ENCHANTABLE = new StructuredDataKey<>("enchantable", Types.VAR_INT);
+    public static final StructuredDataKey<Equippable> EQUIPPABLE = new StructuredDataKey<>("equippable", Equippable.TYPE);
+    public static final StructuredDataKey<HolderSet> REPAIRABLE = new StructuredDataKey<>("repairable", Types.HOLDER_SET);
+    public static final StructuredDataKey<Unit> GLIDER = new StructuredDataKey<>("glider", Types.EMPTY);
+    public static final StructuredDataKey<String> TOOLTIP_STYLE = new StructuredDataKey<>("tooltip_style", Types.STRING);
+    public static final StructuredDataKey<DeathProtection> DEATH_PROTECTION = new StructuredDataKey<>("death_protection", DeathProtection.TYPE);
     public static final StructuredDataKey<Enchantments> STORED_ENCHANTMENTS = new StructuredDataKey<>("stored_enchantments", Enchantments.TYPE);
     public static final StructuredDataKey<DyedColor> DYED_COLOR = new StructuredDataKey<>("dyed_color", DyedColor.TYPE);
     public static final StructuredDataKey<Integer> MAP_COLOR = new StructuredDataKey<>("map_color", Types.INT);
@@ -90,18 +116,26 @@ public record StructuredDataKey<T>(String identifier, Type<T> type) {
     public static final StructuredDataKey<Integer> MAP_POST_PROCESSING = new StructuredDataKey<>("map_post_processing", Types.VAR_INT);
     public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_20_5 = new StructuredDataKey<>("charged_projectiles", Types1_20_5.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_21 = new StructuredDataKey<>("charged_projectiles", Types1_21.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_21_2 = new StructuredDataKey<>("charged_projectiles", Types1_21_2.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES1_21_4 = new StructuredDataKey<>("charged_projectiles", Types1_21_4.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_20_5 = new StructuredDataKey<>("bundle_contents", Types1_20_5.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_21 = new StructuredDataKey<>("bundle_contents", Types1_21.ITEM_ARRAY);
-    public static final StructuredDataKey<PotionContents> POTION_CONTENTS = new StructuredDataKey<>("potion_contents", PotionContents.TYPE);
+    public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_21_2 = new StructuredDataKey<>("bundle_contents", Types1_21_2.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS1_21_4 = new StructuredDataKey<>("bundle_contents", Types1_21_4.ITEM_ARRAY);
+    public static final StructuredDataKey<PotionContents> POTION_CONTENTS1_20_5 = new StructuredDataKey<>("potion_contents", PotionContents.TYPE1_20_5);
+    public static final StructuredDataKey<PotionContents> POTION_CONTENTS1_21_2 = new StructuredDataKey<>("potion_contents", PotionContents.TYPE1_21_2);
     public static final StructuredDataKey<SuspiciousStewEffect[]> SUSPICIOUS_STEW_EFFECTS = new StructuredDataKey<>("suspicious_stew_effects", SuspiciousStewEffect.ARRAY_TYPE);
     public static final StructuredDataKey<FilterableString[]> WRITABLE_BOOK_CONTENT = new StructuredDataKey<>("writable_book_content", FilterableString.ARRAY_TYPE);
     public static final StructuredDataKey<WrittenBook> WRITTEN_BOOK_CONTENT = new StructuredDataKey<>("written_book_content", WrittenBook.TYPE);
-    public static final StructuredDataKey<ArmorTrim> TRIM = new StructuredDataKey<>("trim", ArmorTrim.TYPE);
+    public static final StructuredDataKey<ArmorTrim> TRIM1_20_5 = new StructuredDataKey<>("trim", ArmorTrim.TYPE1_20_5);
+    public static final StructuredDataKey<ArmorTrim> TRIM1_21_2 = new StructuredDataKey<>("trim", ArmorTrim.TYPE1_21_2);
+    public static final StructuredDataKey<ArmorTrim> TRIM1_21_4 = new StructuredDataKey<>("trim", ArmorTrim.TYPE1_21_4);
     public static final StructuredDataKey<CompoundTag> DEBUG_STICK_STATE = new StructuredDataKey<>("debug_stick_state", Types.COMPOUND_TAG);
     public static final StructuredDataKey<CompoundTag> ENTITY_DATA = new StructuredDataKey<>("entity_data", Types.COMPOUND_TAG);
     public static final StructuredDataKey<CompoundTag> BUCKET_ENTITY_DATA = new StructuredDataKey<>("bucket_entity_data", Types.COMPOUND_TAG);
     public static final StructuredDataKey<CompoundTag> BLOCK_ENTITY_DATA = new StructuredDataKey<>("block_entity_data", Types.COMPOUND_TAG);
-    public static final StructuredDataKey<Holder<Instrument>> INSTRUMENT = new StructuredDataKey<>("instrument", Instrument.TYPE);
+    public static final StructuredDataKey<Holder<Instrument1_20_5>> INSTRUMENT1_20_5 = new StructuredDataKey<>("instrument", Instrument1_20_5.TYPE);
+    public static final StructuredDataKey<Holder<Instrument1_21_2>> INSTRUMENT1_21_2 = new StructuredDataKey<>("instrument", Instrument1_21_2.TYPE);
     public static final StructuredDataKey<Integer> OMINOUS_BOTTLE_AMPLIFIER = new StructuredDataKey<>("ominous_bottle_amplifier", Types.VAR_INT);
     public static final StructuredDataKey<JukeboxPlayable> JUKEBOX_PLAYABLE = new StructuredDataKey<>("jukebox_playable", JukeboxPlayable.TYPE);
     public static final StructuredDataKey<Tag> RECIPES = new StructuredDataKey<>("recipes", Types.TAG);
@@ -115,6 +149,8 @@ public record StructuredDataKey<T>(String identifier, Type<T> type) {
     public static final StructuredDataKey<PotDecorations> POT_DECORATIONS = new StructuredDataKey<>("pot_decorations", PotDecorations.TYPE);
     public static final StructuredDataKey<Item[]> CONTAINER1_20_5 = new StructuredDataKey<>("container", Types1_20_5.ITEM_ARRAY);
     public static final StructuredDataKey<Item[]> CONTAINER1_21 = new StructuredDataKey<>("container", Types1_21.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> CONTAINER1_21_2 = new StructuredDataKey<>("container", new ArrayType<>(Types1_21_2.ITEM, 256));
+    public static final StructuredDataKey<Item[]> CONTAINER1_21_4 = new StructuredDataKey<>("container", Types1_21_4.ITEM_ARRAY);
     public static final StructuredDataKey<BlockStateProperties> BLOCK_STATE = new StructuredDataKey<>("block_state", BlockStateProperties.TYPE);
     public static final StructuredDataKey<Bee[]> BEES = new StructuredDataKey<>("bees", Bee.ARRAY_TYPE);
     public static final StructuredDataKey<Tag> LOCK = new StructuredDataKey<>("lock", Types.TAG);

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_21_2.java

@@ -0,0 +1,314 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.entities;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.util.EntityTypeUtil;
+import com.viaversion.viaversion.util.Key;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public enum EntityTypes1_21_2 implements EntityType {
+
+    ENTITY(null, null),
+
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    OMINOUS_ITEM_SPAWNER(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
+
+    DISPLAY(ENTITY, null),
+    BLOCK_DISPLAY(DISPLAY),
+    ITEM_DISPLAY(DISPLAY),
+    TEXT_DISPLAY(DISPLAY),
+
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE(ENTITY, null),
+    ITEM_PROJECTILE(PROJECTILE, null),
+    SNOWBALL(ITEM_PROJECTILE),
+    ENDER_PEARL(ITEM_PROJECTILE),
+    EGG(ITEM_PROJECTILE),
+    POTION(ITEM_PROJECTILE),
+    EXPERIENCE_BOTTLE(ITEM_PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    ABSTRACT_WIND_CHARGE(PROJECTILE, null),
+    WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+    BREEZE_WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    ABSTRACT_BOAT(VEHICLE, null),
+    ABSTRACT_CHEST_BOAT(ABSTRACT_BOAT, null),
+    ACACIA_BOAT(ABSTRACT_BOAT),
+    ACACIA_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    BAMBOO_CHEST_RAFT(ABSTRACT_CHEST_BOAT),
+    BAMBOO_RAFT(ABSTRACT_BOAT),
+    BIRCH_BOAT(ABSTRACT_BOAT),
+    BIRCH_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    CHERRY_BOAT(ABSTRACT_BOAT),
+    CHERRY_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    DARK_OAK_BOAT(ABSTRACT_BOAT),
+    DARK_OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    JUNGLE_BOAT(ABSTRACT_BOAT),
+    JUNGLE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    MANGROVE_BOAT(ABSTRACT_BOAT),
+    MANGROVE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    OAK_BOAT(ABSTRACT_BOAT),
+    OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    PALE_OAK_BOAT(ABSTRACT_BOAT),
+    PALE_OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    SPRUCE_BOAT(ABSTRACT_BOAT),
+    SPRUCE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+    SNIFFER(ABSTRACT_ANIMAL),
+    ARMADILLO(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    BREEZE(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+    WARDEN(ABSTRACT_MONSTER),
+    CREAKING(ABSTRACT_MONSTER),
+    CREAKING_TRANSIENT(CREAKING),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+    BOGGED(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Water mobs
+    AGEABLE_WATER_CREATURE(ABSTRACT_AGEABLE, null),
+    DOLPHIN(AGEABLE_WATER_CREATURE),
+
+    SQUID(AGEABLE_WATER_CREATURE),
+    GLOW_SQUID(SQUID),
+
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
+    private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
+
+    EntityTypes1_21_2(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
+    }
+
+    EntityTypes1_21_2(final EntityType parent, @Nullable final String identifier) {
+        this.parent = parent;
+        this.identifier = identifier;
+    }
+
+    @Override
+    public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
+        return id;
+    }
+
+    @Override
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
+        return parent;
+    }
+
+    @Override
+    public boolean isAbstractType() {
+        return identifier == null;
+    }
+
+    public static EntityType getTypeFromId(final int typeId) {
+        return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
+    }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_21_4.java

@@ -0,0 +1,313 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.entities;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.util.EntityTypeUtil;
+import com.viaversion.viaversion.util.Key;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public enum EntityTypes1_21_4 implements EntityType {
+
+    ENTITY(null, null),
+
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    OMINOUS_ITEM_SPAWNER(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
+
+    DISPLAY(ENTITY, null),
+    BLOCK_DISPLAY(DISPLAY),
+    ITEM_DISPLAY(DISPLAY),
+    TEXT_DISPLAY(DISPLAY),
+
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE(ENTITY, null),
+    ITEM_PROJECTILE(PROJECTILE, null),
+    SNOWBALL(ITEM_PROJECTILE),
+    ENDER_PEARL(ITEM_PROJECTILE),
+    EGG(ITEM_PROJECTILE),
+    POTION(ITEM_PROJECTILE),
+    EXPERIENCE_BOTTLE(ITEM_PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    ABSTRACT_WIND_CHARGE(PROJECTILE, null),
+    WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+    BREEZE_WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    ABSTRACT_BOAT(VEHICLE, null),
+    ABSTRACT_CHEST_BOAT(ABSTRACT_BOAT, null),
+    ACACIA_BOAT(ABSTRACT_BOAT),
+    ACACIA_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    BAMBOO_CHEST_RAFT(ABSTRACT_CHEST_BOAT),
+    BAMBOO_RAFT(ABSTRACT_BOAT),
+    BIRCH_BOAT(ABSTRACT_BOAT),
+    BIRCH_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    CHERRY_BOAT(ABSTRACT_BOAT),
+    CHERRY_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    DARK_OAK_BOAT(ABSTRACT_BOAT),
+    DARK_OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    JUNGLE_BOAT(ABSTRACT_BOAT),
+    JUNGLE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    MANGROVE_BOAT(ABSTRACT_BOAT),
+    MANGROVE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    OAK_BOAT(ABSTRACT_BOAT),
+    OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    PALE_OAK_BOAT(ABSTRACT_BOAT),
+    PALE_OAK_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+    SPRUCE_BOAT(ABSTRACT_BOAT),
+    SPRUCE_CHEST_BOAT(ABSTRACT_CHEST_BOAT),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+    SNIFFER(ABSTRACT_ANIMAL),
+    ARMADILLO(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    BREEZE(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+    WARDEN(ABSTRACT_MONSTER),
+    CREAKING(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+    BOGGED(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Water mobs
+    AGEABLE_WATER_CREATURE(ABSTRACT_AGEABLE, null),
+    DOLPHIN(AGEABLE_WATER_CREATURE),
+
+    SQUID(AGEABLE_WATER_CREATURE),
+    GLOW_SQUID(SQUID),
+
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
+    private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
+
+    EntityTypes1_21_4(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
+    }
+
+    EntityTypes1_21_4(final EntityType parent, @Nullable final String identifier) {
+        this.parent = parent;
+        this.identifier = identifier;
+    }
+
+    @Override
+    public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
+        return id;
+    }
+
+    @Override
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
+        return parent;
+    }
+
+    @Override
+    public boolean isAbstractType() {
+        return identifier == null;
+    }
+
+    public static EntityType getTypeFromId(final int typeId) {
+        return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
+    }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_21.java

@@ -26,10 +26,11 @@ import com.viaversion.viaversion.api.minecraft.PaintingVariant;
 import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.WolfVariant;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.ArrayType;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
-import com.viaversion.viaversion.api.type.types.version.Types1_21;
 
 public final class EntityDataTypes1_21 extends AbstractEntityDataTypes {
 
@@ -40,7 +41,7 @@ public final class EntityDataTypes1_21 extends AbstractEntityDataTypes {
     public final EntityDataType stringType = add(4, Types.STRING);
     public final EntityDataType componentType = add(5, Types.TAG);
     public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_TAG);
-    public final EntityDataType itemType = add(7, Types1_21.ITEM);
+    public final EntityDataType itemType;
     public final EntityDataType booleanType = add(8, Types.BOOLEAN);
     public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
     public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
@@ -59,14 +60,15 @@ public final class EntityDataTypes1_21 extends AbstractEntityDataTypes {
     public final EntityDataType wolfVariantType = add(23, WolfVariant.TYPE);
     public final EntityDataType frogVariantType = add(24, Types.VAR_INT);
     public final EntityDataType optionalGlobalPosition = add(25, Types.OPTIONAL_GLOBAL_POSITION);
-    public final EntityDataType paintingVariantType = add(26, PaintingVariant.TYPE);
+    public final EntityDataType paintingVariantType = add(26, PaintingVariant.TYPE1_21);
     public final EntityDataType snifferState = add(27, Types.VAR_INT);
     public final EntityDataType armadilloState = add(28, Types.VAR_INT);
     public final EntityDataType vector3FType = add(29, Types.VECTOR3F);
     public final EntityDataType quaternionType = add(30, Types.QUATERNION);
 
-    public EntityDataTypes1_21(final ParticleType particleType, final ArrayType<Particle> particlesType) {
+    public EntityDataTypes1_21(final Type<Item> itemType, final ParticleType particleType, final ArrayType<Particle> particlesType) {
         super(31);
+        this.itemType = add(7, itemType);
         this.particleType = add(17, particleType);
         this.particlesType = add(18, particlesType);
     }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_21_2.java

@@ -0,0 +1,74 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.PaintingVariant;
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.WolfVariant;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_21_2 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType longType = add(2, Types.VAR_LONG);
+    public final EntityDataType floatType = add(3, Types.FLOAT);
+    public final EntityDataType stringType = add(4, Types.STRING);
+    public final EntityDataType componentType = add(5, Types.TAG);
+    public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_TAG);
+    public final EntityDataType itemType;
+    public final EntityDataType booleanType = add(8, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(11, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(12, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(13, Types.OPTIONAL_UUID);
+    public final EntityDataType blockStateType = add(14, Types.VAR_INT);
+    public final EntityDataType optionalBlockStateType = add(15, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(16, Types.COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType particlesType;
+    public final EntityDataType villagerDatatType = add(19, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(20, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(21, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(22, Types.VAR_INT);
+    public final EntityDataType wolfVariantType = add(23, WolfVariant.TYPE);
+    public final EntityDataType frogVariantType = add(24, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(25, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(26, PaintingVariant.TYPE1_21_2);
+    public final EntityDataType snifferState = add(27, Types.VAR_INT);
+    public final EntityDataType armadilloState = add(28, Types.VAR_INT);
+    public final EntityDataType vector3FType = add(29, Types.VECTOR3F);
+    public final EntityDataType quaternionType = add(30, Types.QUATERNION);
+
+    public EntityDataTypes1_21_2(final Type<Item> itemType, final ParticleType particleType, final Type<Particle[]> particlesType) {
+        super(31);
+        this.itemType = add(7, itemType);
+        this.particleType = add(17, particleType);
+        this.particlesType = add(18, particlesType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/ArmorTrim.java

@@ -29,10 +29,10 @@ import it.unimi.dsi.fastutil.ints.Int2IntFunction;
 
 public record ArmorTrim(Holder<ArmorTrimMaterial> material, Holder<ArmorTrimPattern> pattern, boolean showInTooltip) {
 
-    public static final Type<ArmorTrim> TYPE = new Type<>(ArmorTrim.class) {
+    public static final Type<ArmorTrim> TYPE1_20_5 = new Type<>(ArmorTrim.class) {
         @Override
         public ArmorTrim read(final ByteBuf buffer) {
-            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE.read(buffer);
+            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE1_20_5.read(buffer);
             final Holder<ArmorTrimPattern> pattern = ArmorTrimPattern.TYPE.read(buffer);
             final boolean showInTooltip = buffer.readBoolean();
             return new ArmorTrim(material, pattern, showInTooltip);
@@ -40,7 +40,39 @@ public record ArmorTrim(Holder<ArmorTrimMaterial> material, Holder<ArmorTrimPatt
 
         @Override
         public void write(final ByteBuf buffer, final ArmorTrim value) {
-            ArmorTrimMaterial.TYPE.write(buffer, value.material);
+            ArmorTrimMaterial.TYPE1_20_5.write(buffer, value.material);
+            ArmorTrimPattern.TYPE.write(buffer, value.pattern);
+            buffer.writeBoolean(value.showInTooltip);
+        }
+    };
+    public static final Type<ArmorTrim> TYPE1_21_2 = new Type<>(ArmorTrim.class) {
+        @Override
+        public ArmorTrim read(final ByteBuf buffer) {
+            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE1_21_2.read(buffer);
+            final Holder<ArmorTrimPattern> pattern = ArmorTrimPattern.TYPE.read(buffer);
+            final boolean showInTooltip = buffer.readBoolean();
+            return new ArmorTrim(material, pattern, showInTooltip);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final ArmorTrim value) {
+            ArmorTrimMaterial.TYPE1_21_2.write(buffer, value.material);
+            ArmorTrimPattern.TYPE.write(buffer, value.pattern);
+            buffer.writeBoolean(value.showInTooltip);
+        }
+    };
+    public static final Type<ArmorTrim> TYPE1_21_4 = new Type<>(ArmorTrim.class) {
+        @Override
+        public ArmorTrim read(final ByteBuf buffer) {
+            final Holder<ArmorTrimMaterial> material = ArmorTrimMaterial.TYPE1_21_4.read(buffer);
+            final Holder<ArmorTrimPattern> pattern = ArmorTrimPattern.TYPE.read(buffer);
+            final boolean showInTooltip = buffer.readBoolean();
+            return new ArmorTrim(material, pattern, showInTooltip);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final ArmorTrim value) {
+            ArmorTrimMaterial.TYPE1_21_4.write(buffer, value.material);
             ArmorTrimPattern.TYPE.write(buffer, value.pattern);
             buffer.writeBoolean(value.showInTooltip);
         }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/ArmorTrimMaterial.java

@@ -27,13 +27,19 @@ import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.HolderType;
 import io.netty.buffer.ByteBuf;
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
-import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
-import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectArrayMap;
+import java.util.Map;
 
 public record ArmorTrimMaterial(String assetName, int itemId, float itemModelIndex,
-                                Int2ObjectMap<String> overrideArmorMaterials, Tag description) {
+                                Map<String, String> overrideArmorMaterials, Tag description) {
 
-    public static final HolderType<ArmorTrimMaterial> TYPE = new HolderType<>() {
+    public ArmorTrimMaterial(final String assetName, final int itemId, final Map<String, String> overrideArmorMaterials, final Tag description) {
+        this(assetName, itemId, 0F, overrideArmorMaterials, description);
+    }
+
+    public static final HolderType<ArmorTrimMaterial> TYPE1_20_5 = new HolderType<>() {
+        // The override key is an int, but given we don't use it at all and that creating a new type is annoying,
+        // we'll just store it in the string map:tm:
         @Override
         public ArmorTrimMaterial readDirect(final ByteBuf buffer) {
             final String assetName = Types.STRING.read(buffer);
@@ -41,10 +47,45 @@ public record ArmorTrimMaterial(String assetName, int itemId, float itemModelInd
             final float itemModelIndex = buffer.readFloat();
 
             final int overrideArmorMaterialsSize = Types.VAR_INT.readPrimitive(buffer);
-            final Int2ObjectMap<String> overrideArmorMaterials = new Int2ObjectOpenHashMap<>(overrideArmorMaterialsSize);
+            final Map<String, String> overrideArmorMaterials = new Object2ObjectArrayMap<>(overrideArmorMaterialsSize);
             for (int i = 0; i < overrideArmorMaterialsSize; i++) {
                 final int key = Types.VAR_INT.readPrimitive(buffer);
                 final String value = Types.STRING.read(buffer);
+                overrideArmorMaterials.put(Integer.toString(key), value);
+            }
+
+            final Tag description = Types.TAG.read(buffer);
+            return new ArmorTrimMaterial(assetName, item, itemModelIndex, overrideArmorMaterials, description);
+        }
+
+        @Override
+        public void writeDirect(final ByteBuf buffer, final ArmorTrimMaterial value) {
+            Types.STRING.write(buffer, value.assetName());
+            Types.VAR_INT.writePrimitive(buffer, value.itemId());
+            buffer.writeFloat(value.itemModelIndex());
+
+            Types.VAR_INT.writePrimitive(buffer, value.overrideArmorMaterials().size());
+            for (final Map.Entry<String, String> entry : value.overrideArmorMaterials().entrySet()) {
+                Types.VAR_INT.writePrimitive(buffer, Integer.parseInt(entry.getKey()));
+                Types.STRING.write(buffer, entry.getValue());
+            }
+
+            Types.TAG.write(buffer, value.description());
+        }
+    };
+
+    public static final HolderType<ArmorTrimMaterial> TYPE1_21_2 = new HolderType<>() {
+        @Override
+        public ArmorTrimMaterial readDirect(final ByteBuf buffer) {
+            final String assetName = Types.STRING.read(buffer);
+            final int item = Types.VAR_INT.readPrimitive(buffer);
+            final float itemModelIndex = buffer.readFloat();
+
+            final int overrideArmorMaterialsSize = Types.VAR_INT.readPrimitive(buffer);
+            final Map<String, String> overrideArmorMaterials = new Object2ObjectArrayMap<>(overrideArmorMaterialsSize);
+            for (int i = 0; i < overrideArmorMaterialsSize; i++) {
+                final String key = Types.STRING.read(buffer);
+                final String value = Types.STRING.read(buffer);
                 overrideArmorMaterials.put(key, value);
             }
 
@@ -59,8 +100,41 @@ public record ArmorTrimMaterial(String assetName, int itemId, float itemModelInd
             buffer.writeFloat(value.itemModelIndex());
 
             Types.VAR_INT.writePrimitive(buffer, value.overrideArmorMaterials().size());
-            for (final Int2ObjectMap.Entry<String> entry : value.overrideArmorMaterials().int2ObjectEntrySet()) {
-                Types.VAR_INT.writePrimitive(buffer, entry.getIntKey());
+            for (final Map.Entry<String, String> entry : value.overrideArmorMaterials().entrySet()) {
+                Types.STRING.write(buffer, entry.getKey());
+                Types.STRING.write(buffer, entry.getValue());
+            }
+
+            Types.TAG.write(buffer, value.description());
+        }
+    };
+
+    public static final HolderType<ArmorTrimMaterial> TYPE1_21_4 = new HolderType<>() {
+        @Override
+        public ArmorTrimMaterial readDirect(final ByteBuf buffer) {
+            final String assetName = Types.STRING.read(buffer);
+            final int item = Types.VAR_INT.readPrimitive(buffer);
+
+            final int overrideArmorMaterialsSize = Types.VAR_INT.readPrimitive(buffer);
+            final Map<String, String> overrideArmorMaterials = new Object2ObjectArrayMap<>(overrideArmorMaterialsSize);
+            for (int i = 0; i < overrideArmorMaterialsSize; i++) {
+                final String key = Types.STRING.read(buffer);
+                final String value = Types.STRING.read(buffer);
+                overrideArmorMaterials.put(key, value);
+            }
+
+            final Tag description = Types.TAG.read(buffer);
+            return new ArmorTrimMaterial(assetName, item, overrideArmorMaterials, description);
+        }
+
+        @Override
+        public void writeDirect(final ByteBuf buffer, final ArmorTrimMaterial value) {
+            Types.STRING.write(buffer, value.assetName());
+            Types.VAR_INT.writePrimitive(buffer, value.itemId());
+
+            Types.VAR_INT.writePrimitive(buffer, value.overrideArmorMaterials().size());
+            for (final Map.Entry<String, String> entry : value.overrideArmorMaterials().entrySet()) {
+                Types.STRING.write(buffer, entry.getKey());
                 Types.STRING.write(buffer, entry.getValue());
             }
 

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/Consumable1_21_2.java

@@ -0,0 +1,111 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.SoundEvent;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import io.netty.buffer.ByteBuf;
+
+public record Consumable1_21_2(float consumeSeconds, int animationType, Holder<SoundEvent> sound,
+                               boolean hasConsumeParticles, ConsumeEffect<?>[] consumeEffects) {
+
+    public static final Type<?>[] EFFECT_TYPES = {
+        ApplyStatusEffects.TYPE,
+        Types.HOLDER_SET, // remove effects
+        Types.EMPTY, // clear all effects
+        Types.FLOAT, // teleport randomly
+        Types.SOUND_EVENT // play sound
+    };
+
+    public static final Type<Consumable1_21_2> TYPE = new Type<>(Consumable1_21_2.class) {
+        @Override
+        public Consumable1_21_2 read(final ByteBuf buffer) {
+            final float consumeSeconds = buffer.readFloat();
+            final int animationType = Types.VAR_INT.readPrimitive(buffer);
+            final Holder<SoundEvent> sound = Types.SOUND_EVENT.read(buffer);
+            final boolean hasConsumeParticles = buffer.readBoolean();
+            final ConsumeEffect<?>[] consumeEffects = ConsumeEffect.ARRAY_TYPE.read(buffer);
+            return new Consumable1_21_2(consumeSeconds, animationType, sound, hasConsumeParticles, consumeEffects);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final Consumable1_21_2 value) {
+            buffer.writeFloat(value.consumeSeconds);
+            Types.VAR_INT.writePrimitive(buffer, value.animationType);
+            Types.SOUND_EVENT.write(buffer, value.sound);
+            buffer.writeBoolean(value.hasConsumeParticles);
+            ConsumeEffect.ARRAY_TYPE.write(buffer, value.consumeEffects);
+        }
+    };
+
+    public record ConsumeEffect<T>(int id, Type<T> type, T value) {
+
+        public static final Type<ConsumeEffect<?>> TYPE = new Type<>(ConsumeEffect.class) {
+            @Override
+            public ConsumeEffect<?> read(final ByteBuf buffer) {
+                // Oh no...
+                final int effectType = Types.VAR_INT.readPrimitive(buffer);
+                final Type<?> type = EFFECT_TYPES[effectType];
+                final Object value = type.read(buffer);
+                return ConsumeEffect.of(effectType, type, value);
+            }
+
+            @Override
+            public void write(final ByteBuf buffer, final ConsumeEffect<?> value) {
+                Types.VAR_INT.writePrimitive(buffer, value.id);
+                value.writeValue(buffer);
+            }
+        };
+        public static final Type<ConsumeEffect<?>[]> ARRAY_TYPE = new ArrayType<>(TYPE);
+
+        static <T> ConsumeEffect<T> of(final int id, final Type<T> type, final Object value) {
+            //noinspection unchecked
+            return new ConsumeEffect<>(id, type, (T) value);
+        }
+
+        void writeValue(final ByteBuf buf) {
+            this.type.write(buf, this.value);
+        }
+    }
+
+    public record ApplyStatusEffects(PotionEffect[] effects, float probability) {
+
+        public static final Type<ApplyStatusEffects> TYPE = new Type<>(ApplyStatusEffects.class) {
+            @Override
+            public ApplyStatusEffects read(final ByteBuf buffer) {
+                final PotionEffect[] effects = PotionEffect.ARRAY_TYPE.read(buffer);
+                final float probability = buffer.readFloat();
+                return new ApplyStatusEffects(effects, probability);
+            }
+
+            @Override
+            public void write(final ByteBuf buffer, final ApplyStatusEffects value) {
+                PotionEffect.ARRAY_TYPE.write(buffer, value.effects);
+                buffer.writeFloat(value.probability);
+            }
+        };
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/CustomModelData1_21_4.java

@@ -0,0 +1,49 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+public record CustomModelData1_21_4(float[] floats, boolean[] booleans, String[] strings, int[] colors) {
+
+    public static final Type<CustomModelData1_21_4> TYPE = new Type<>(CustomModelData1_21_4.class) {
+        @Override
+        public CustomModelData1_21_4 read(final ByteBuf buffer) {
+            final float[] floats = Types.FLOAT_ARRAY_PRIMITIVE.read(buffer);
+            final boolean[] booleans = Types.BOOLEAN_ARRAY_PRIMITIVE.read(buffer);
+            final String[] strings = Types.STRING_ARRAY.read(buffer);
+            final int[] colors = Types.INT_ARRAY_PRIMITIVE.read(buffer);
+            return new CustomModelData1_21_4(floats, booleans, strings, colors);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final CustomModelData1_21_4 value) {
+            Types.FLOAT_ARRAY_PRIMITIVE.write(buffer, value.floats());
+            Types.BOOLEAN_ARRAY_PRIMITIVE.write(buffer, value.booleans());
+            Types.STRING_ARRAY.write(buffer, value.strings());
+            Types.INT_ARRAY_PRIMITIVE.write(buffer, value.colors());
+        }
+    };
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/DamageResistant.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+public record DamageResistant(String typesTagKey) {
+
+    public static final Type<DamageResistant> TYPE = new Type<>(DamageResistant.class) {
+        @Override
+        public DamageResistant read(final ByteBuf buffer) {
+            final String typesTagKey = Types.STRING.read(buffer);
+            return new DamageResistant(typesTagKey);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final DamageResistant value) {
+            Types.STRING.write(buffer, value.typesTagKey());
+        }
+    };
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/DeathProtection.java

@@ -22,26 +22,23 @@
  */
 package com.viaversion.viaversion.api.minecraft.item.data;
 
+import com.viaversion.viaversion.api.minecraft.item.data.Consumable1_21_2.ConsumeEffect;
 import com.viaversion.viaversion.api.type.Type;
-import com.viaversion.viaversion.api.type.types.ArrayType;
+import com.viaversion.viaversion.api.type.Types;
 import io.netty.buffer.ByteBuf;
 
-public record FoodEffect(PotionEffect effect, float probability) {
+public record DeathProtection(ConsumeEffect<?>[] deathEffects) {
 
-    public static final Type<FoodEffect> TYPE = new Type<>(FoodEffect.class) {
+    public static final Type<DeathProtection> TYPE = new Type<>(DeathProtection.class) {
         @Override
-        public FoodEffect read(final ByteBuf buffer) {
-            final PotionEffect effect = PotionEffect.TYPE.read(buffer);
-            final float probability = buffer.readFloat();
-            return new FoodEffect(effect, probability);
+        public DeathProtection read(final ByteBuf buffer) {
+            final ConsumeEffect<?>[] deathEffects = ConsumeEffect.ARRAY_TYPE.read(buffer);
+            return new DeathProtection(deathEffects);
         }
 
         @Override
-        public void write(final ByteBuf buffer, final FoodEffect value) {
-            PotionEffect.TYPE.write(buffer, value.effect);
-            buffer.writeFloat(value.probability);
+        public void write(final ByteBuf buffer, final DeathProtection value) {
+            ConsumeEffect.ARRAY_TYPE.write(buffer, value.deathEffects);
         }
     };
-    public static final Type<FoodEffect[]> ARRAY_TYPE = new ArrayType<>(TYPE);
-
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/Equippable.java

@@ -0,0 +1,69 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.HolderSet;
+import com.viaversion.viaversion.api.minecraft.SoundEvent;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public record Equippable(int equipmentSlot, Holder<SoundEvent> soundEvent, @Nullable String model,
+                         @Nullable String cameraOverlay, @Nullable HolderSet allowedEntities, boolean dispensable,
+                         boolean swappable, boolean damageOnHurt) {
+
+    public static final Type<Equippable> TYPE = new Type<>(Equippable.class) {
+        @Override
+        public Equippable read(final ByteBuf buffer) {
+            final int equipmentSlot = Types.VAR_INT.readPrimitive(buffer);
+            final Holder<SoundEvent> soundEvent = Types.SOUND_EVENT.read(buffer);
+            final String model = Types.OPTIONAL_STRING.read(buffer);
+            final String cameraOverlay = Types.OPTIONAL_STRING.read(buffer);
+            final HolderSet allowedEntities = Types.OPTIONAL_HOLDER_SET.read(buffer);
+            final boolean dispensable = buffer.readBoolean();
+            final boolean swappable = buffer.readBoolean();
+            final boolean damageOnHurt = buffer.readBoolean();
+            return new Equippable(equipmentSlot, soundEvent, model, cameraOverlay, allowedEntities, dispensable, swappable, damageOnHurt);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final Equippable value) {
+            Types.VAR_INT.writePrimitive(buffer, value.equipmentSlot());
+            Types.SOUND_EVENT.write(buffer, value.soundEvent());
+            Types.OPTIONAL_STRING.write(buffer, value.model());
+            Types.OPTIONAL_STRING.write(buffer, value.cameraOverlay());
+            Types.OPTIONAL_HOLDER_SET.write(buffer, value.allowedEntities());
+            buffer.writeBoolean(value.dispensable());
+            buffer.writeBoolean(value.swappable());
+            buffer.writeBoolean(value.damageOnHurt());
+        }
+    };
+
+    public Equippable rewrite(final Int2IntFunction soundIdRewriter) {
+        final Holder<SoundEvent> soundEvent = this.soundEvent.updateId(soundIdRewriter);
+        return soundEvent == this.soundEvent ? this : new Equippable(equipmentSlot, soundEvent, model, cameraOverlay, allowedEntities, dispensable, swappable, damageOnHurt);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/FoodProperties1_20_5.java

@@ -25,25 +25,27 @@ package com.viaversion.viaversion.api.minecraft.item.data;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.ArrayType;
 import com.viaversion.viaversion.api.type.types.version.Types1_21;
 import io.netty.buffer.ByteBuf;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
-public record FoodProperties(int nutrition, float saturationModifier, boolean canAlwaysEat, float eatSeconds,
-                             Item usingConvertsTo, FoodEffect[] possibleEffects) {
+public record FoodProperties1_20_5(int nutrition, float saturationModifier, boolean canAlwaysEat, float eatSeconds,
+                                   @Nullable Item usingConvertsTo, FoodEffect[] possibleEffects) {
 
-    public static final Type<FoodProperties> TYPE1_20_5 = new Type<>(FoodProperties.class) {
+    public static final Type<FoodProperties1_20_5> TYPE1_20_5 = new Type<>(FoodProperties1_20_5.class) {
         @Override
-        public FoodProperties read(final ByteBuf buffer) {
+        public FoodProperties1_20_5 read(final ByteBuf buffer) {
             final int nutrition = Types.VAR_INT.readPrimitive(buffer);
             final float saturationModifier = buffer.readFloat();
             final boolean canAlwaysEat = buffer.readBoolean();
             final float eatSeconds = buffer.readFloat();
             final FoodEffect[] possibleEffects = FoodEffect.ARRAY_TYPE.read(buffer);
-            return new FoodProperties(nutrition, saturationModifier, canAlwaysEat, eatSeconds, null, possibleEffects);
+            return new FoodProperties1_20_5(nutrition, saturationModifier, canAlwaysEat, eatSeconds, null, possibleEffects);
         }
 
         @Override
-        public void write(final ByteBuf buffer, final FoodProperties value) {
+        public void write(final ByteBuf buffer, final FoodProperties1_20_5 value) {
             Types.VAR_INT.writePrimitive(buffer, value.nutrition);
             buffer.writeFloat(value.saturationModifier);
             buffer.writeBoolean(value.canAlwaysEat);
@@ -51,20 +53,20 @@ public record FoodProperties(int nutrition, float saturationModifier, boolean ca
             FoodEffect.ARRAY_TYPE.write(buffer, value.possibleEffects);
         }
     };
-    public static final Type<FoodProperties> TYPE1_21 = new Type<FoodProperties>(FoodProperties.class) {
+    public static final Type<FoodProperties1_20_5> TYPE1_21 = new Type<>(FoodProperties1_20_5.class) {
         @Override
-        public FoodProperties read(final ByteBuf buffer) {
+        public FoodProperties1_20_5 read(final ByteBuf buffer) {
             final int nutrition = Types.VAR_INT.readPrimitive(buffer);
             final float saturationModifier = buffer.readFloat();
             final boolean canAlwaysEat = buffer.readBoolean();
             final float eatSeconds = buffer.readFloat();
             final Item usingConvertsTo = Types1_21.OPTIONAL_ITEM.read(buffer);
             final FoodEffect[] possibleEffects = FoodEffect.ARRAY_TYPE.read(buffer);
-            return new FoodProperties(nutrition, saturationModifier, canAlwaysEat, eatSeconds, usingConvertsTo, possibleEffects);
+            return new FoodProperties1_20_5(nutrition, saturationModifier, canAlwaysEat, eatSeconds, usingConvertsTo, possibleEffects);
         }
 
         @Override
-        public void write(final ByteBuf buffer, final FoodProperties value) {
+        public void write(final ByteBuf buffer, final FoodProperties1_20_5 value) {
             Types.VAR_INT.writePrimitive(buffer, value.nutrition);
             buffer.writeFloat(value.saturationModifier);
             buffer.writeBoolean(value.canAlwaysEat);
@@ -73,4 +75,23 @@ public record FoodProperties(int nutrition, float saturationModifier, boolean ca
             FoodEffect.ARRAY_TYPE.write(buffer, value.possibleEffects);
         }
     };
+
+    public record FoodEffect(PotionEffect effect, float probability) {
+
+        public static final Type<FoodEffect> TYPE = new Type<>(FoodEffect.class) {
+            @Override
+            public FoodEffect read(final ByteBuf buffer) {
+                final PotionEffect effect = PotionEffect.TYPE.read(buffer);
+                final float probability = buffer.readFloat();
+                return new FoodEffect(effect, probability);
+            }
+
+            @Override
+            public void write(final ByteBuf buffer, final FoodEffect value) {
+                PotionEffect.TYPE.write(buffer, value.effect);
+                buffer.writeFloat(value.probability);
+            }
+        };
+        public static final Type<FoodEffect[]> ARRAY_TYPE = new ArrayType<>(TYPE);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/FoodProperties1_21_2.java

@@ -0,0 +1,47 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+public record FoodProperties1_21_2(int nutrition, float saturationModifier, boolean canAlwaysEat) {
+
+    public static final Type<FoodProperties1_21_2> TYPE = new Type<>(FoodProperties1_21_2.class) {
+        @Override
+        public FoodProperties1_21_2 read(final ByteBuf buffer) {
+            final int nutrition = Types.VAR_INT.readPrimitive(buffer);
+            final float saturationModifier = buffer.readFloat();
+            final boolean canAlwaysEat = buffer.readBoolean();
+            return new FoodProperties1_21_2(nutrition, saturationModifier, canAlwaysEat);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final FoodProperties1_21_2 value) {
+            Types.VAR_INT.writePrimitive(buffer, value.nutrition);
+            buffer.writeFloat(value.saturationModifier);
+            buffer.writeBoolean(value.canAlwaysEat);
+        }
+    };
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/Instrument1_20_5.java

@@ -29,27 +29,27 @@ import com.viaversion.viaversion.api.type.types.misc.HolderType;
 import io.netty.buffer.ByteBuf;
 import it.unimi.dsi.fastutil.ints.Int2IntFunction;
 
-public record Instrument(Holder<SoundEvent> soundEvent, int useDuration, float range) {
+public record Instrument1_20_5(Holder<SoundEvent> soundEvent, int useDuration, float range) {
 
-    public static final HolderType<Instrument> TYPE = new HolderType<>() {
+    public static final HolderType<Instrument1_20_5> TYPE = new HolderType<>() {
         @Override
-        public Instrument readDirect(final ByteBuf buffer) {
+        public Instrument1_20_5 readDirect(final ByteBuf buffer) {
             final Holder<SoundEvent> soundEvent = Types.SOUND_EVENT.read(buffer);
             final int useDuration = Types.VAR_INT.readPrimitive(buffer);
-            final float range = buffer.readFloat();
-            return new Instrument(soundEvent, useDuration, range);
+            final float range = Types.FLOAT.readPrimitive(buffer);
+            return new Instrument1_20_5(soundEvent, useDuration, range);
         }
 
         @Override
-        public void writeDirect(final ByteBuf buffer, final Instrument value) {
+        public void writeDirect(final ByteBuf buffer, final Instrument1_20_5 value) {
             Types.SOUND_EVENT.write(buffer, value.soundEvent());
             Types.VAR_INT.writePrimitive(buffer, value.useDuration());
-            buffer.writeFloat(value.range());
+            Types.FLOAT.writePrimitive(buffer, value.range());
         }
     };
 
-    public Instrument rewrite(final Int2IntFunction soundIdRewriteFunction) {
+    public Instrument1_20_5 rewrite(final Int2IntFunction soundIdRewriteFunction) {
         final Holder<SoundEvent> soundEvent = this.soundEvent.updateId(soundIdRewriteFunction);
-        return soundEvent == this.soundEvent ? this : new Instrument(soundEvent, useDuration, range);
+        return soundEvent == this.soundEvent ? this : new Instrument1_20_5(soundEvent, useDuration, range);
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/Instrument1_21_2.java

@@ -0,0 +1,58 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.SoundEvent;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.HolderType;
+import io.netty.buffer.ByteBuf;
+import it.unimi.dsi.fastutil.ints.Int2IntFunction;
+
+public record Instrument1_21_2(Holder<SoundEvent> soundEvent, float useDuration, float range, Tag description) {
+
+    public static final HolderType<Instrument1_21_2> TYPE = new HolderType<>() {
+        @Override
+        public Instrument1_21_2 readDirect(final ByteBuf buffer) {
+            final Holder<SoundEvent> soundEvent = Types.SOUND_EVENT.read(buffer);
+            final float useDuration = Types.FLOAT.readPrimitive(buffer);
+            final float range = Types.FLOAT.readPrimitive(buffer);
+            final Tag description = Types.TAG.read(buffer);
+            return new Instrument1_21_2(soundEvent, useDuration, range, description);
+        }
+
+        @Override
+        public void writeDirect(final ByteBuf buffer, final Instrument1_21_2 value) {
+            Types.SOUND_EVENT.write(buffer, value.soundEvent());
+            Types.FLOAT.writePrimitive(buffer, value.useDuration());
+            Types.FLOAT.writePrimitive(buffer, value.range());
+            Types.TAG.write(buffer, value.description());
+        }
+    };
+
+    public Instrument1_21_2 rewrite(final Int2IntFunction soundIdRewriteFunction) {
+        final Holder<SoundEvent> soundEvent = this.soundEvent.updateId(soundIdRewriteFunction);
+        return soundEvent == this.soundEvent ? this : new Instrument1_21_2(soundEvent, useDuration, range, description);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/PotionContents.java

@@ -27,15 +27,20 @@ import com.viaversion.viaversion.api.type.Types;
 import io.netty.buffer.ByteBuf;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public record PotionContents(@Nullable Integer potion, @Nullable Integer customColor, PotionEffect[] customEffects) {
+public record PotionContents(@Nullable Integer potion, @Nullable Integer customColor, PotionEffect[] customEffects,
+                             @Nullable String customName) {
 
-    public static final Type<PotionContents> TYPE = new Type<>(PotionContents.class) {
+    public PotionContents(final @Nullable Integer potion, final @Nullable Integer customColor, final PotionEffect[] customEffects) {
+        this(potion, customColor, customEffects, null);
+    }
+
+    public static final Type<PotionContents> TYPE1_20_5 = new Type<>(PotionContents.class) {
         @Override
         public PotionContents read(final ByteBuf buffer) {
             final Integer potion = buffer.readBoolean() ? Types.VAR_INT.readPrimitive(buffer) : null;
             final Integer customColor = buffer.readBoolean() ? buffer.readInt() : null;
             final PotionEffect[] customEffects = PotionEffect.ARRAY_TYPE.read(buffer);
-            return new PotionContents(potion, customColor, customEffects);
+            return new PotionContents(potion, customColor, customEffects, null);
         }
 
         @Override
@@ -53,4 +58,31 @@ public record PotionContents(@Nullable Integer potion, @Nullable Integer customC
             PotionEffect.ARRAY_TYPE.write(buffer, value.customEffects);
         }
     };
+
+    public static final Type<PotionContents> TYPE1_21_2 = new Type<>(PotionContents.class) {
+        @Override
+        public PotionContents read(final ByteBuf buffer) {
+            final Integer potion = buffer.readBoolean() ? Types.VAR_INT.readPrimitive(buffer) : null;
+            final Integer customColor = buffer.readBoolean() ? buffer.readInt() : null;
+            final PotionEffect[] customEffects = PotionEffect.ARRAY_TYPE.read(buffer);
+            final String customName = Types.OPTIONAL_STRING.read(buffer);
+            return new PotionContents(potion, customColor, customEffects, customName);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final PotionContents value) {
+            buffer.writeBoolean(value.potion != null);
+            if (value.potion != null) {
+                Types.VAR_INT.writePrimitive(buffer, value.potion);
+            }
+
+            buffer.writeBoolean(value.customColor != null);
+            if (value.customColor != null) {
+                buffer.writeInt(value.customColor);
+            }
+
+            PotionEffect.ARRAY_TYPE.write(buffer, value.customEffects);
+            Types.OPTIONAL_STRING.write(buffer, value.customName);
+        }
+    };
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/UseCooldown.java

@@ -0,0 +1,56 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+import java.util.function.Function;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public record UseCooldown(float seconds, @Nullable String cooldownGroup) {
+
+    public static final Type<UseCooldown> TYPE = new Type<>(UseCooldown.class) {
+        @Override
+        public UseCooldown read(final ByteBuf buffer) {
+            final float seconds = buffer.readFloat();
+            final String cooldownGroup = Types.OPTIONAL_STRING.read(buffer);
+            return new UseCooldown(seconds, cooldownGroup);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final UseCooldown value) {
+            buffer.writeFloat(value.seconds());
+            Types.OPTIONAL_STRING.write(buffer, value.cooldownGroup());
+        }
+    };
+
+    public UseCooldown rewrite(final Function<String, String> idRewriter) {
+        if (cooldownGroup == null) {
+            return this;
+        }
+
+        final String mappedCooldownGroup = idRewriter.apply(cooldownGroup);
+        return new UseCooldown(seconds, mappedCooldownGroup);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/protocol/AbstractProtocol.java

@@ -198,6 +198,14 @@ public abstract class AbstractProtocol<CU extends ClientboundPacketType, CM exte
         }
     }
 
+    public void registerFinishConfiguration(final CU packetType, final PacketHandler handler) {
+        registerClientbound(packetType, wrapper -> {
+            // TODO Temporary solution to handle the finish configuration packet already having changed our tracked protocol state in a previous handler
+            wrapper.user().getProtocolInfo().setServerState(State.CONFIGURATION);
+            handler.handle(wrapper);
+        });
+    }
+
     @Override
     public final void loadMappingData() {
         getMappingData().load();

api/src/main/java/com/viaversion/viaversion/api/protocol/Protocol.java

@@ -36,6 +36,7 @@ import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
 import com.viaversion.viaversion.api.rewriter.ComponentRewriter;
 import com.viaversion.viaversion.api.rewriter.EntityRewriter;
 import com.viaversion.viaversion.api.rewriter.ItemRewriter;
+import com.viaversion.viaversion.api.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.api.rewriter.TagRewriter;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.exception.CancelException;
@@ -374,6 +375,15 @@ public interface Protocol<CU extends ClientboundPacketType, CM extends Clientbou
         return null;
     }
 
+    /**
+     * Returns the protocol's particle rewriter if present.
+     *
+     * @return particle rewriter
+     */
+    default @Nullable ParticleRewriter getParticleRewriter() {
+        return null;
+    }
+
     /**
      * Returns the protocol's tag rewriter if present.
      *

api/src/main/java/com/viaversion/viaversion/api/protocol/version/ProtocolVersion.java

@@ -43,7 +43,8 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
     private static final List<ProtocolVersion> VERSION_LIST = new ArrayList<>();
 
     public static final ProtocolVersion v1_7_2 = register(4, "1.7.2-1.7.5", new SubVersionRange("1.7", 2, 5));
-    @Deprecated(forRemoval=true) public static final ProtocolVersion v1_7_1 = v1_7_2;
+    @Deprecated(forRemoval = true)
+    public static final ProtocolVersion v1_7_1 = v1_7_2;
     public static final ProtocolVersion v1_7_6 = register(5, "1.7.6-1.7.10", new SubVersionRange("1.7", 6, 10));
     public static final ProtocolVersion v1_8 = register(47, "1.8.x", new SubVersionRange("1.8", 0, 9));
     public static final ProtocolVersion v1_9 = register(107, "1.9");
@@ -85,8 +86,14 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
     public static final ProtocolVersion v1_20_3 = register(765, "1.20.3-1.20.4", new SubVersionRange("1.20", 3, 4));
     public static final ProtocolVersion v1_20_5 = register(766, "1.20.5-1.20.6", new SubVersionRange("1.20", 5, 6));
     public static final ProtocolVersion v1_21 = register(767, "1.21-1.21.1", new SubVersionRange("1.21", 0, 1));
+    public static final ProtocolVersion v1_21_2 = register(768, "1.21.2-1.21.3", new SubVersionRange("1.21", 2, 3));
+    public static final ProtocolVersion v1_21_4 = register(769, "1.21.4");
     public static final ProtocolVersion unknown = new ProtocolVersion(VersionType.SPECIAL, -1, -1, "UNKNOWN", null);
 
+    static {
+        unknown.known = false;
+    }
+
     public static ProtocolVersion register(int version, String name) {
         return register(version, -1, name);
     }
@@ -150,7 +157,11 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
                 return protocolVersion;
             }
         }
-        return new ProtocolVersion(VersionType.SPECIAL, version, -1, "Unknown (" + version + ")", null);
+
+        // Will be made nullable instead in the future...
+        final ProtocolVersion unknown = new ProtocolVersion(versionType, version, -1, "Unknown (" + version + ")", null);
+        unknown.known = false;
+        return unknown;
     }
 
     public static @NonNull ProtocolVersion getProtocol(final int version) {
@@ -201,6 +212,8 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
     private final int snapshotVersion;
     private final String name;
     private final Set<String> includedVersions;
+    @Deprecated // Remove when getProtocol is made nullable
+    private boolean known = true;
 
     /**
      * Constructs a new ProtocolVersion instance.
@@ -285,12 +298,12 @@ public class ProtocolVersion implements Comparable<ProtocolVersion> {
     }
 
     /**
-     * Returns whether the protocol is set. Should only be unknown for unregistered protocols returned by {@link #getProtocol(int)}.
+     * Returns whether the protocol version is {@link #unknown}. For checking if the protocol version is registered, use {@link #isRegistered(VersionType, int)}
      *
-     * @return true if the protocol is set
+     * @return true if the protocol version is unknown
      */
     public boolean isKnown() {
-        return version != -1;
+        return known;
     }
 
     /**

api/src/main/java/com/viaversion/viaversion/api/rewriter/EntityRewriter.java

@@ -58,6 +58,14 @@ public interface EntityRewriter<T extends Protocol<?, ?, ?, ?>> extends Rewriter
      */
     int newEntityId(int id);
 
+    /**
+     * Returns the mapped entity (or the same if it has not changed).
+     *
+     * @param identifier unmapped entity identifier
+     * @return mapped entity identifier
+     */
+    String mappedEntityIdentifier(String identifier);
+
     /**
      * Handles and transforms entity data of an entity.
      *

api/src/main/java/com/viaversion/viaversion/api/rewriter/ParticleRewriter.java

@@ -0,0 +1,27 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.api.rewriter;
+
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.Particle;
+
+public interface ParticleRewriter {
+
+    void rewriteParticle(UserConnection connection, Particle particle);
+
+}

api/src/main/java/com/viaversion/viaversion/api/type/Types.java

@@ -45,12 +45,14 @@ import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
 import com.viaversion.viaversion.api.minecraft.ChunkPosition;
 import com.viaversion.viaversion.api.type.types.ArrayType;
 import com.viaversion.viaversion.api.type.types.BitSetType;
+import com.viaversion.viaversion.api.type.types.BooleanArrayType;
 import com.viaversion.viaversion.api.type.types.BooleanType;
 import com.viaversion.viaversion.api.type.types.ByteArrayType;
 import com.viaversion.viaversion.api.type.types.ByteType;
 import com.viaversion.viaversion.api.type.types.ComponentType;
 import com.viaversion.viaversion.api.type.types.DoubleType;
 import com.viaversion.viaversion.api.type.types.EmptyType;
+import com.viaversion.viaversion.api.type.types.FloatArrayType;
 import com.viaversion.viaversion.api.type.types.FloatType;
 import com.viaversion.viaversion.api.type.types.IntArrayType;
 import com.viaversion.viaversion.api.type.types.IntType;
@@ -115,14 +117,17 @@ public final class Types {
     public static final Type<byte[]> OPTIONAL_BYTE_ARRAY_PRIMITIVE = new ByteArrayType.OptionalByteArrayType();
     public static final Type<byte[]> SHORT_BYTE_ARRAY = new ShortByteArrayType();
     public static final Type<byte[]> REMAINING_BYTES = new RemainingBytesType();
-    public static final Type<int[]> INT_ARRAY_PRIMITIVE = new IntArrayType();
 
     public static final ShortType SHORT = new ShortType();
     public static final UnsignedShortType UNSIGNED_SHORT = new UnsignedShortType();
 
     public static final IntType INT = new IntType();
+    public static final Type<int[]> INT_ARRAY_PRIMITIVE = new IntArrayType();
+
     public static final FloatType FLOAT = new FloatType();
     public static final FloatType.OptionalFloatType OPTIONAL_FLOAT = new FloatType.OptionalFloatType();
+    public static final Type<float[]> FLOAT_ARRAY_PRIMITIVE = new FloatArrayType();
+
     public static final DoubleType DOUBLE = new DoubleType();
 
     public static final LongType LONG = new LongType();
@@ -130,6 +135,7 @@ public final class Types {
 
     public static final BooleanType BOOLEAN = new BooleanType();
     public static final BooleanType.OptionalBooleanType OPTIONAL_BOOLEAN = new BooleanType.OptionalBooleanType();
+    public static final Type<boolean[]> BOOLEAN_ARRAY_PRIMITIVE = new BooleanArrayType();
 
     /* Other Types */
     public static final Type<JsonElement> COMPONENT = new ComponentType();
@@ -149,6 +155,8 @@ public final class Types {
     public static final VarLongType VAR_LONG = new VarLongType();
 
     /* MC Types */
+    public static final Type<byte[]> SERVERBOUND_CUSTOM_PAYLOAD_DATA = new RemainingBytesType(Short.MAX_VALUE);
+
     public static final Type<BlockPosition> BLOCK_POSITION1_8 = new BlockPositionType1_8();
     public static final Type<BlockPosition> OPTIONAL_POSITION1_8 = new BlockPositionType1_8.OptionalBlockPositionType();
     public static final Type<BlockPosition> BLOCK_POSITION1_14 = new BlockPositionType1_14();
@@ -189,7 +197,10 @@ public final class Types {
     public static final Type<PlayerMessageSignature> OPTIONAL_PLAYER_MESSAGE_SIGNATURE = new PlayerMessageSignatureType.OptionalPlayerMessageSignatureType();
     public static final Type<PlayerMessageSignature[]> PLAYER_MESSAGE_SIGNATURE_ARRAY = new ArrayType<>(PLAYER_MESSAGE_SIGNATURE);
 
-    public static final BitSetType PROFILE_ACTIONS_ENUM = new BitSetType(6);
+    public static final BitSetType PROFILE_ACTIONS_ENUM1_19_3 = new BitSetType(6);
+    public static final BitSetType PROFILE_ACTIONS_ENUM1_21_2 = new BitSetType(7);
+    public static final BitSetType PROFILE_ACTIONS_ENUM1_21_4 = new BitSetType(8);
+
     public static final ByteArrayType SIGNATURE_BYTES = new ByteArrayType(256);
     public static final BitSetType ACKNOWLEDGED_BIT_SET = new BitSetType(20);
     public static final ByteArrayType.OptionalByteArrayType OPTIONAL_SIGNATURE_BYTES = new ByteArrayType.OptionalByteArrayType(256);

api/src/main/java/com/viaversion/viaversion/api/type/types/ArrayType.java

@@ -26,13 +26,22 @@ import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
 import io.netty.buffer.ByteBuf;
 import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.List;
 
 public class ArrayType<T> extends Type<T[]> {
     private final Type<T> elementType;
+    private final int maxLength;
 
     public ArrayType(Type<T> type) {
+        this(type, -1);
+    }
+
+    public ArrayType(Type<T> type, int maxLength) {
+        //noinspection unchecked
         super(type.getTypeName() + " Array", (Class<T[]>) getArrayClass(type.getOutputClass()));
         this.elementType = type;
+        this.maxLength = maxLength;
     }
 
     public static Class<?> getArrayClass(Class<?> componentType) {
@@ -43,16 +52,40 @@ public class ArrayType<T> extends Type<T[]> {
     @Override
     public T[] read(ByteBuf buffer) {
         int amount = Types.VAR_INT.readPrimitive(buffer);
-        T[] array = (T[]) Array.newInstance(elementType.getOutputClass(), amount);
+        if (maxLength != -1 && amount > maxLength) {
+            throw new IllegalArgumentException("Array length " + amount + " is longer than maximum " + maxLength);
+        }
 
-        for (int i = 0; i < amount; i++) {
+        return amount < Short.MAX_VALUE ? readArray(buffer, amount) : readList(buffer, amount);
+    }
+
+    private T[] readArray(ByteBuf buffer, int length) {
+        T[] array = createArray(length);
+        for (int i = 0; i < length; i++) {
             array[i] = elementType.read(buffer);
         }
         return array;
     }
 
+    private T[] readList(ByteBuf buffer, int length) {
+        List<T> list = new ArrayList<>();
+        for (int i = 0; i < length; i++) {
+            list.add(elementType.read(buffer));
+        }
+        return list.toArray(createArray(0));
+    }
+
+    private T[] createArray(int length) {
+        //noinspection unchecked
+        return (T[]) Array.newInstance(elementType.getOutputClass(), length);
+    }
+
     @Override
     public void write(ByteBuf buffer, T[] object) {
+        if (maxLength != -1 && object.length > maxLength) {
+            throw new IllegalArgumentException("Array length " + object.length + " is longer than maximum " + maxLength);
+        }
+
         Types.VAR_INT.writePrimitive(buffer, object.length);
         for (T o : object) {
             elementType.write(buffer, o);

api/src/main/java/com/viaversion/viaversion/api/type/types/BooleanArrayType.java

@@ -0,0 +1,67 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+// Ok...
+public class BooleanArrayType extends Type<boolean[]> {
+
+    private final int length;
+
+    public BooleanArrayType(final int length) {
+        super(boolean[].class);
+        this.length = length;
+    }
+
+    public BooleanArrayType() {
+        super(boolean[].class);
+        this.length = -1;
+    }
+
+    @Override
+    public void write(final ByteBuf buffer, final boolean[] object) {
+        if (this.length != -1) {
+            Preconditions.checkArgument(length == object.length, "Length does not match expected length");
+        } else {
+            Types.VAR_INT.writePrimitive(buffer, object.length);
+        }
+        for (final boolean b : object) {
+            buffer.writeBoolean(b);
+        }
+    }
+
+    @Override
+    public boolean[] read(final ByteBuf buffer) {
+        final int length = this.length == -1 ? Types.VAR_INT.readPrimitive(buffer) : this.length;
+        Preconditions.checkArgument(buffer.isReadable(length), "Length is fewer than readable bytes");
+        final boolean[] array = new boolean[length];
+        for (int i = 0; i < length; i++) {
+            array[i] = buffer.readBoolean();
+        }
+        return array;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/FloatArrayType.java

@@ -0,0 +1,66 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import io.netty.buffer.ByteBuf;
+
+public class FloatArrayType extends Type<float[]> {
+
+    private final int length;
+
+    public FloatArrayType(final int length) {
+        super(float[].class);
+        this.length = length;
+    }
+
+    public FloatArrayType() {
+        super(float[].class);
+        this.length = -1;
+    }
+
+    @Override
+    public void write(final ByteBuf buffer, final float[] object) {
+        if (this.length != -1) {
+            Preconditions.checkArgument(length == object.length, "Length does not match expected length");
+        } else {
+            Types.VAR_INT.writePrimitive(buffer, object.length);
+        }
+        for (final float f : object) {
+            buffer.writeFloat(f);
+        }
+    }
+
+    @Override
+    public float[] read(final ByteBuf buffer) {
+        final int length = this.length == -1 ? Types.VAR_INT.readPrimitive(buffer) : this.length;
+        Preconditions.checkArgument(buffer.isReadable(length), "Length is fewer than readable bytes");
+        final float[] array = new float[length];
+        for (int i = 0; i < length; i++) {
+            array[i] = buffer.readFloat();
+        }
+        return array;
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/IntType.java

@@ -36,11 +36,19 @@ public class IntType extends Type<Integer> implements TypeConverter<Integer> {
         return buffer.readInt();
     }
 
+    public int readPrimitive(ByteBuf buffer) {
+        return buffer.readInt();
+    }
+
     @Override
     public void write(ByteBuf buffer, Integer object) {
         buffer.writeInt(object);
     }
 
+    public void writePrimitive(ByteBuf buffer, int object) {
+        buffer.writeInt(object);
+    }
+
     @Override
     public Integer from(Object o) {
         if (o instanceof Number number) {

api/src/main/java/com/viaversion/viaversion/api/type/types/RemainingBytesType.java

@@ -26,19 +26,35 @@ import com.viaversion.viaversion.api.type.Type;
 import io.netty.buffer.ByteBuf;
 
 public class RemainingBytesType extends Type<byte[]> {
+    private final int maxLength;
+
     public RemainingBytesType() {
+        this(-1);
+    }
+
+    public RemainingBytesType(final int maxLength) {
         super(byte[].class);
+        this.maxLength = maxLength;
     }
 
     @Override
-    public byte[] read(ByteBuf buffer) {
-        byte[] array = new byte[buffer.readableBytes()];
+    public byte[] read(final ByteBuf buffer) {
+        final int bytes = buffer.readableBytes();
+        if (maxLength != -1 && bytes > maxLength) {
+            throw new RuntimeException("Remaining bytes cannot be longer than " + maxLength + " (got " + bytes + ")");
+        }
+
+        final byte[] array = new byte[bytes];
         buffer.readBytes(array);
         return array;
     }
 
     @Override
-    public void write(ByteBuf buffer, byte[] object) {
+    public void write(final ByteBuf buffer, final byte[] object) {
+        if (maxLength != -1 && object.length > maxLength) {
+            throw new RuntimeException("Remaining bytes cannot be longer than " + maxLength + " (got " + object.length + ")");
+        }
+
         buffer.writeBytes(object);
     }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/VarIntType.java

@@ -32,6 +32,15 @@ public class VarIntType extends Type<Integer> implements TypeConverter<Integer>
     private static final int VALUE_BITS = 0x7F;
     private static final int MULTI_BYTE_BITS = ~VALUE_BITS;
     private static final int MAX_BYTES = 5;
+    private static final int[] VAR_INT_LENGTHS = new int[65];
+
+    static {
+        // Copied from Velocity https://github.com/PaperMC/Velocity/blob/08a42b3723633ea5eb6b96c0bb42180f3c2b07eb/proxy/src/main/java/com/velocitypowered/proxy/protocol/ProtocolUtils.java#L166
+        for (int i = 0; i <= 32; ++i) {
+            VAR_INT_LENGTHS[i] = (int) Math.ceil((31d - (i - 1)) / 7d);
+        }
+        VAR_INT_LENGTHS[32] = 1; // Special case for the number 0.
+    }
 
     public VarIntType() {
         super("VarInt", Integer.class);
@@ -88,4 +97,8 @@ public class VarIntType extends Type<Integer> implements TypeConverter<Integer>
         }
         throw new UnsupportedOperationException();
     }
-}
+
+    public static int varIntLength(final int value) {
+        return VAR_INT_LENGTHS[Integer.numberOfLeadingZeros(value)];
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/ChunkSectionType1_18.java

@@ -22,6 +22,7 @@
  */
 package com.viaversion.viaversion.api.type.types.chunk;
 
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
 import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
 import com.viaversion.viaversion.api.minecraft.chunks.ChunkSectionImpl;
 import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
@@ -54,4 +55,14 @@ public final class ChunkSectionType1_18 extends Type<ChunkSection> {
         blockPaletteType.write(buffer, section.palette(PaletteType.BLOCKS));
         biomePaletteType.write(buffer, section.palette(PaletteType.BIOMES));
     }
+
+    public int serializedSize(final Chunk chunk) {
+        int length = 0;
+        for (final ChunkSection section : chunk.getSections()) {
+            length += Short.BYTES
+                + blockPaletteType.serializedSize(section.palette(PaletteType.BLOCKS))
+                + biomePaletteType.serializedSize(section.palette(PaletteType.BIOMES));
+        }
+        return length;
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/ChunkType1_18.java

@@ -52,14 +52,10 @@ public final class ChunkType1_18 extends Type<Chunk> {
         final CompoundTag heightMap = Types.NAMED_COMPOUND_TAG.read(buffer);
 
         // Read sections
-        final ByteBuf sectionsBuf = buffer.readBytes(Types.VAR_INT.readPrimitive(buffer));
+        final ByteBuf sectionsBuf = buffer.readSlice(Types.VAR_INT.readPrimitive(buffer));
         final ChunkSection[] sections = new ChunkSection[ySectionCount];
-        try {
-            for (int i = 0; i < ySectionCount; i++) {
-                sections[i] = sectionType.read(sectionsBuf);
-            }
-        } finally {
-            sectionsBuf.release();
+        for (int i = 0; i < ySectionCount; i++) {
+            sections[i] = sectionType.read(sectionsBuf);
         }
 
         final int blockEntitiesLength = Types.VAR_INT.readPrimitive(buffer);
@@ -78,16 +74,9 @@ public final class ChunkType1_18 extends Type<Chunk> {
 
         Types.NAMED_COMPOUND_TAG.write(buffer, chunk.getHeightMap());
 
-        final ByteBuf sectionBuffer = buffer.alloc().buffer();
-        try {
-            for (final ChunkSection section : chunk.getSections()) {
-                sectionType.write(sectionBuffer, section);
-            }
-            sectionBuffer.readerIndex(0);
-            Types.VAR_INT.writePrimitive(buffer, sectionBuffer.readableBytes());
-            buffer.writeBytes(sectionBuffer);
-        } finally {
-            sectionBuffer.release(); // release buffer
+        Types.VAR_INT.writePrimitive(buffer, sectionType.serializedSize(chunk));
+        for (final ChunkSection section : chunk.getSections()) {
+            sectionType.write(buffer, section);
         }
 
         Types.VAR_INT.writePrimitive(buffer, chunk.blockEntities().size());

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/ChunkType1_20_2.java

@@ -52,14 +52,10 @@ public final class ChunkType1_20_2 extends Type<Chunk> {
         final CompoundTag heightMap = Types.COMPOUND_TAG.read(buffer);
 
         // Read sections
-        final ByteBuf sectionsBuf = buffer.readBytes(Types.VAR_INT.readPrimitive(buffer));
+        final ByteBuf sectionsBuf = buffer.readSlice(Types.VAR_INT.readPrimitive(buffer));
         final ChunkSection[] sections = new ChunkSection[ySectionCount];
-        try {
-            for (int i = 0; i < ySectionCount; i++) {
-                sections[i] = sectionType.read(sectionsBuf);
-            }
-        } finally {
-            sectionsBuf.release();
+        for (int i = 0; i < ySectionCount; i++) {
+            sections[i] = sectionType.read(sectionsBuf);
         }
 
         final int blockEntitiesLength = Types.VAR_INT.readPrimitive(buffer);
@@ -78,16 +74,9 @@ public final class ChunkType1_20_2 extends Type<Chunk> {
 
         Types.COMPOUND_TAG.write(buffer, chunk.getHeightMap());
 
-        final ByteBuf sectionBuffer = buffer.alloc().buffer();
-        try {
-            for (final ChunkSection section : chunk.getSections()) {
-                sectionType.write(sectionBuffer, section);
-            }
-            sectionBuffer.readerIndex(0);
-            Types.VAR_INT.writePrimitive(buffer, sectionBuffer.readableBytes());
-            buffer.writeBytes(sectionBuffer);
-        } finally {
-            sectionBuffer.release(); // release buffer
+        Types.VAR_INT.writePrimitive(buffer, sectionType.serializedSize(chunk));
+        for (final ChunkSection section : chunk.getSections()) {
+            sectionType.write(buffer, section);
         }
 
         Types.VAR_INT.writePrimitive(buffer, chunk.blockEntities().size());

api/src/main/java/com/viaversion/viaversion/api/type/types/chunk/PaletteType1_18.java

@@ -27,6 +27,7 @@ import com.viaversion.viaversion.api.minecraft.chunks.DataPaletteImpl;
 import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.VarIntType;
 import com.viaversion.viaversion.util.CompactArrayUtil;
 import com.viaversion.viaversion.util.MathUtil;
 import io.netty.buffer.ByteBuf;
@@ -94,13 +95,7 @@ public final class PaletteType1_18 extends Type<DataPalette> {
             return;
         }
 
-        // 1, 2, and 3 bit linear block palettes can't be read by the client
-        final int min = type == PaletteType.BLOCKS ? 4 : 1;
-        int bitsPerValue = Math.max(min, MathUtil.ceilLog2(size));
-        if (bitsPerValue > type.highestBitsPerValue()) {
-            bitsPerValue = globalPaletteBits;
-        }
-
+        final int bitsPerValue = bitsPerValue(size);
         buffer.writeByte(bitsPerValue);
 
         if (bitsPerValue != globalPaletteBits) {
@@ -113,4 +108,39 @@ public final class PaletteType1_18 extends Type<DataPalette> {
 
         Types.LONG_ARRAY_PRIMITIVE.write(buffer, CompactArrayUtil.createCompactArrayWithPadding(bitsPerValue, type.size(), bitsPerValue == globalPaletteBits ? palette::idAt : palette::paletteIndexAt));
     }
+
+    private int bitsPerValue(final int size) {
+        // 1, 2, and 3 bit linear block palettes can't be read by the client
+        final int min = type == PaletteType.BLOCKS ? 4 : 1;
+        int bitsPerValue = Math.max(min, MathUtil.ceilLog2(size));
+        if (bitsPerValue > type.highestBitsPerValue()) {
+            bitsPerValue = globalPaletteBits;
+        }
+        return bitsPerValue;
+    }
+
+    public int serializedSize(final DataPalette palette) {
+        // This is a bit of extra work, but worth it to avoid otherwise having to allocate and write to an extra buffer.
+        // On top of saving memory, it provides small but measurable speedup compared to writing to a separate buffer and then back
+        final int size = palette.size();
+        final int bitsPerValue = bitsPerValue(size);
+        int serializedTypesSize = 0;
+        int serializedValuesSize = 1; // At least one byte for 0 length
+        if (size == 1) {
+            serializedTypesSize = VarIntType.varIntLength(palette.idByIndex(0));
+        } else {
+            if (bitsPerValue != globalPaletteBits) {
+                serializedTypesSize = VarIntType.varIntLength(size);
+                for (int i = 0; i < size; i++) {
+                    serializedTypesSize += VarIntType.varIntLength(palette.idByIndex(i));
+                }
+            }
+
+            final int valuesPerLong = 64 / bitsPerValue;
+            final int values = (type.size() + valuesPerLong - 1) / valuesPerLong;
+            serializedValuesSize = VarIntType.varIntLength(values) + (Long.BYTES * values);
+        }
+
+        return Byte.BYTES + serializedTypesSize + serializedValuesSize;
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/item/ItemType1_20_5.java

@@ -63,7 +63,7 @@ public class ItemType1_20_5 extends Type<Item> {
             return new Reference2ObjectOpenHashMap<>();
         }
 
-        final Map<StructuredDataKey<?>, StructuredData<?>> map = new Reference2ObjectOpenHashMap<>();
+        final Map<StructuredDataKey<?>, StructuredData<?>> map = new Reference2ObjectOpenHashMap<>(Math.min(valuesSize + markersSize, 128));
         for (int i = 0; i < valuesSize; i++) {
             final StructuredData<?> value = dataType.read(buffer);
             final StructuredDataKey<?> key = dataType.key(value.id());

api/src/main/java/com/viaversion/viaversion/api/type/types/item/StructuredDataType.java

@@ -87,5 +87,12 @@ public class StructuredDataType extends Type<StructuredData<?>> {
             types[id] = key;
             return this;
         }
+
+        public DataFiller add(final StructuredDataKey<?>... keys) {
+            for (final StructuredDataKey<?> key : keys) {
+                add(key);
+            }
+            return this;
+        }
     }
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/misc/ParticleType.java

@@ -29,7 +29,6 @@ import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.type.Type;
 import com.viaversion.viaversion.api.type.Types;
-import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
 import com.viaversion.viaversion.util.Key;
 import io.netty.buffer.ByteBuf;
 
@@ -77,6 +76,10 @@ public class ParticleType extends DynamicType<Particle> {
             particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Blue 0-1
             particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Scale 0.01-4
         };
+        public static final DataReader<Particle> DUST1_21_2 = (buf, particle) -> {
+            particle.add(Types.INT, Types.INT.readPrimitive(buf)); // RGB
+            particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Scale 0.01-4
+        };
         public static final DataReader<Particle> DUST_TRANSITION = (buf, particle) -> {
             particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Red 0-1
             particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Green 0-1
@@ -86,6 +89,11 @@ public class ParticleType extends DynamicType<Particle> {
             particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Green
             particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Blue
         };
+        public static final DataReader<Particle> DUST_TRANSITION1_21_2 = (buf, particle) -> {
+            particle.add(Types.INT, Types.INT.readPrimitive(buf)); // From RGB
+            particle.add(Types.INT, Types.INT.readPrimitive(buf)); // To RGB
+            particle.add(Types.FLOAT, Types.FLOAT.readPrimitive(buf)); // Scale 0.01-4
+        };
         public static final DataReader<Particle> VIBRATION = (buf, particle) -> {
             particle.add(Types.BLOCK_POSITION1_14, Types.BLOCK_POSITION1_14.read(buf)); // From block pos
 
@@ -136,7 +144,22 @@ public class ParticleType extends DynamicType<Particle> {
         public static final DataReader<Particle> SHRIEK = (buf, particle) -> {
             particle.add(Types.VAR_INT, Types.VAR_INT.readPrimitive(buf)); // Delay
         };
-        public static final DataReader<Particle> COLOR = (buf, particle) -> particle.add(Types.INT, buf.readInt());
+        public static final DataReader<Particle> COLOR = (buf, particle) -> {
+            particle.add(Types.INT, Types.INT.readPrimitive(buf));
+        };
+        public static final DataReader<Particle> TRAIL1_21_2 = (buf, particle) -> {
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target X
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Y
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Z
+            particle.add(Types.INT, Types.INT.readPrimitive(buf)); // Color
+        };
+        public static final DataReader<Particle> TRAIL1_21_4 = (buf, particle) -> {
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target X
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Y
+            particle.add(Types.DOUBLE, Types.DOUBLE.readPrimitive(buf)); // Target Z
+            particle.add(Types.INT, Types.INT.readPrimitive(buf)); // Color
+            particle.add(Types.VAR_INT, Types.VAR_INT.readPrimitive(buf)); // Duration
+        };
 
         public static DataReader<Particle> item(Type<Item> item) {
             return (buf, particle) -> particle.add(item, item.read(buf));

api/src/main/java/com/viaversion/viaversion/api/type/types/version/Types1_21.java

@@ -50,7 +50,7 @@ public final class Types1_21 {
 
     public static final ParticleType PARTICLE = new ParticleType();
     public static final ArrayType<Particle> PARTICLES = new ArrayType<>(PARTICLE);
-    public static final EntityDataTypes1_21 ENTITY_DATA_TYPES = new EntityDataTypes1_21(PARTICLE, PARTICLES);
+    public static final EntityDataTypes1_21 ENTITY_DATA_TYPES = new EntityDataTypes1_21(ITEM, PARTICLE, PARTICLES);
     public static final Type<EntityData> ENTITY_DATA = new EntityDataType(ENTITY_DATA_TYPES);
     public static final Type<List<EntityData>> ENTITY_DATA_LIST = new EntityDataListType(ENTITY_DATA);
 }

api/src/main/java/com/viaversion/viaversion/api/type/types/version/Types1_21_2.java

@@ -0,0 +1,55 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types.version;
+
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.data.StructuredData;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_21_2;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import com.viaversion.viaversion.api.type.types.entitydata.EntityDataListType;
+import com.viaversion.viaversion.api.type.types.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.types.item.ItemCostType1_20_5;
+import com.viaversion.viaversion.api.type.types.item.ItemType1_20_5;
+import com.viaversion.viaversion.api.type.types.item.StructuredDataType;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+import java.util.List;
+
+// Most of these are only safe to use after protocol loading
+public final class Types1_21_2 {
+
+    public static final StructuredDataType STRUCTURED_DATA = new StructuredDataType();
+    public static final Type<StructuredData<?>[]> STRUCTURED_DATA_ARRAY = new ArrayType<>(STRUCTURED_DATA);
+    public static final ItemType1_20_5 ITEM = new ItemType1_20_5(STRUCTURED_DATA);
+    public static final Type<Item[]> ITEM_ARRAY = new ArrayType<>(ITEM);
+    public static final Type<Item> ITEM_COST = new ItemCostType1_20_5(STRUCTURED_DATA_ARRAY);
+    public static final Type<Item> OPTIONAL_ITEM_COST = new ItemCostType1_20_5.OptionalItemCostType(ITEM_COST);
+
+    public static final ParticleType PARTICLE = new ParticleType();
+    public static final Type<Particle[]> PARTICLES = new ArrayType<>(PARTICLE);
+    public static final EntityDataTypes1_21_2 ENTITY_DATA_TYPES = new EntityDataTypes1_21_2(ITEM, PARTICLE, PARTICLES);
+    public static final Type<EntityData> ENTITY_DATA = new EntityDataType(ENTITY_DATA_TYPES);
+    public static final Type<List<EntityData>> ENTITY_DATA_LIST = new EntityDataListType(ENTITY_DATA);
+}

api/src/main/java/com/viaversion/viaversion/api/type/types/version/Types1_21_4.java

@@ -0,0 +1,55 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.viaversion.viaversion.api.type.types.version;
+
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.data.StructuredData;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_21;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import com.viaversion.viaversion.api.type.types.entitydata.EntityDataListType;
+import com.viaversion.viaversion.api.type.types.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.types.item.ItemCostType1_20_5;
+import com.viaversion.viaversion.api.type.types.item.ItemType1_20_5;
+import com.viaversion.viaversion.api.type.types.item.StructuredDataType;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+import java.util.List;
+
+// Most of these are only safe to use after protocol loading
+public final class Types1_21_4 {
+
+    public static final StructuredDataType STRUCTURED_DATA = new StructuredDataType();
+    public static final Type<StructuredData<?>[]> STRUCTURED_DATA_ARRAY = new ArrayType<>(STRUCTURED_DATA);
+    public static final ItemType1_20_5 ITEM = new ItemType1_20_5(STRUCTURED_DATA);
+    public static final Type<Item[]> ITEM_ARRAY = new ArrayType<>(ITEM);
+    public static final Type<Item> ITEM_COST = new ItemCostType1_20_5(STRUCTURED_DATA_ARRAY);
+    public static final Type<Item> OPTIONAL_ITEM_COST = new ItemCostType1_20_5.OptionalItemCostType(ITEM_COST);
+
+    public static final ParticleType PARTICLE = new ParticleType();
+    public static final ArrayType<Particle> PARTICLES = new ArrayType<>(PARTICLE);
+    public static final EntityDataTypes1_21 ENTITY_DATA_TYPES = new EntityDataTypes1_21(ITEM, PARTICLE, PARTICLES);
+    public static final Type<EntityData> ENTITY_DATA = new EntityDataType(ENTITY_DATA_TYPES);
+    public static final Type<List<EntityData>> ENTITY_DATA_LIST = new EntityDataListType(ENTITY_DATA);
+}

api/src/main/java/com/viaversion/viaversion/exception/InformativeException.java

@@ -22,11 +22,14 @@
  */
 package com.viaversion.viaversion.exception;
 
-import java.util.HashMap;
-import java.util.Map;
+import com.viaversion.viaversion.api.Via;
+import java.util.ArrayList;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class InformativeException extends RuntimeException {
-    private final Map<String, Object> info = new HashMap<>();
+    private static final int MAX_MESSAGE_LENGTH = 5_000;
+    private final List<DataEntry> dataEntries = new ArrayList<>();
     private boolean shouldBePrinted = true;
     private int sources;
 
@@ -34,8 +37,8 @@ public class InformativeException extends RuntimeException {
         super(cause);
     }
 
-    public InformativeException set(String key, Object value) {
-        info.put(key, value);
+    public InformativeException set(String key, @Nullable Object value) {
+        dataEntries.add(new DataEntry(key, value));
         return this;
     }
 
@@ -57,14 +60,21 @@ public class InformativeException extends RuntimeException {
 
     @Override
     public String getMessage() {
-        StringBuilder builder = new StringBuilder("Please report this on the Via support Discord or open an issue on the relevant GitHub repository\n");
+        final StringBuilder builder = new StringBuilder("Please report this on the Via support Discord or open an issue on the relevant GitHub repository\n");
         boolean first = true;
-        for (Map.Entry<String, Object> entry : info.entrySet()) {
+        for (final DataEntry entry : dataEntries) {
             if (!first) {
                 builder.append(", ");
+            } else {
+                first = false;
             }
-            builder.append(entry.getKey()).append(": ").append(entry.getValue());
-            first = false;
+
+            builder.append(entry.name()).append(": ");
+            String s = String.valueOf(entry.value());
+            if (!Via.getManager().isDebug() && s.length() > 10 && builder.length() + s.length() > MAX_MESSAGE_LENGTH) {
+                s = s.substring(0, MAX_MESSAGE_LENGTH - builder.length()) + "...";
+            }
+            builder.append(s.replaceAll("\\s", ""));
         }
         return builder.toString();
     }
@@ -74,4 +84,7 @@ public class InformativeException extends RuntimeException {
         // Don't record this stack
         return this;
     }
+
+    private record DataEntry(String name, @Nullable Object value) {
+    }
 }

api/src/main/java/com/viaversion/viaversion/util/Limit.java

@@ -0,0 +1,28 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.util;
+
+public final class Limit {
+
+    public static int max(final int value, final int max) {
+        if (value > max) {
+            throw new IllegalArgumentException("Value " + value + " is higher than the maximum " + max);
+        }
+        return value;
+    }
+}

build-logic/src/main/kotlin/extensions.kt

@@ -1,7 +1,6 @@
 import org.gradle.api.Project
 import org.gradle.api.plugins.JavaPluginExtension
 import org.gradle.jvm.toolchain.JavaLanguageVersion
-import java.io.ByteArrayOutputStream
 
 fun Project.latestCommitHash(): String {
     return runGitCommand(listOf("rev-parse", "--short", "HEAD"))
@@ -16,12 +15,9 @@ fun Project.branchName(): String {
 }
 
 fun Project.runGitCommand(args: List<String>): String {
-    val byteOut = ByteArrayOutputStream()
-    exec {
+    return providers.exec {
         commandLine = listOf("git") + args
-        standardOutput = byteOut
-    }
-    return byteOut.toString(Charsets.UTF_8.name()).trim()
+    }.standardOutput.asBytes.get().toString(Charsets.UTF_8).trim()
 }
 
 fun JavaPluginExtension.javaTarget(version: Int) {

build-logic/src/main/kotlin/via.base-conventions.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     `java-library`
+    `jvm-test-suite`
 }
 
 tasks {

build.gradle.kts

@@ -16,10 +16,10 @@ val main = setOf(
     projects.viaversionBukkit,
     projects.viaversionVelocity,
     projects.viaversionFabric
-).map { it.dependencyProject }
+).map { it.path }
 
 subprojects {
-    when (this) {
+    when (path) {
         in main -> plugins.apply("via.shadow-conventions")
         else -> plugins.apply("via.base-conventions")
     }

bukkit/src/main/java/com/viaversion/viaversion/ViaVersionPlugin.java

@@ -33,6 +33,7 @@ import com.viaversion.viaversion.bukkit.platform.BukkitViaInjector;
 import com.viaversion.viaversion.bukkit.platform.BukkitViaLoader;
 import com.viaversion.viaversion.bukkit.platform.BukkitViaTask;
 import com.viaversion.viaversion.bukkit.platform.BukkitViaTaskTask;
+import com.viaversion.viaversion.bukkit.platform.FoliaViaTask;
 import com.viaversion.viaversion.bukkit.platform.PaperViaInjector;
 import com.viaversion.viaversion.dump.PluginInfo;
 import com.viaversion.viaversion.unsupported.UnsupportedPlugin;
@@ -46,6 +47,7 @@ import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
+import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Event;
 import org.bukkit.event.EventPriority;
@@ -55,6 +57,8 @@ import org.bukkit.plugin.java.JavaPlugin;
 
 public class ViaVersionPlugin extends JavaPlugin implements ViaPlatform<Player> {
     private static final boolean FOLIA = PaperViaInjector.hasClass("io.papermc.paper.threadedregions.RegionizedServer");
+    private static final Runnable DUMMY_RUNNABLE = () -> {
+    };
     private static ViaVersionPlugin instance;
     private final BukkitCommandHandler commandHandler = new BukkitCommandHandler();
     private final BukkitViaConfig conf;
@@ -171,11 +175,36 @@ public class ViaVersionPlugin extends JavaPlugin implements ViaPlatform<Player>
 
     @Override
     public PlatformTask runSync(Runnable runnable, long delay) {
+        if (FOLIA) {
+            // Set the delayed tick to at least 1, as Folia requires this.
+            return new FoliaViaTask(getServer().getGlobalRegionScheduler().runDelayed(this, (e) -> runnable.run(), delay <= 0L ? 1L : delay));
+        }
         return new BukkitViaTask(getServer().getScheduler().runTaskLater(this, runnable, delay));
     }
 
+    public PlatformTask<?> runSyncAt(Runnable runnable, Block block) {
+        if (FOLIA) {
+            return new FoliaViaTask(getServer().getRegionScheduler().run(this, block.getLocation(), (e) -> runnable.run()));
+        }
+        return runSync(runnable);
+    }
+
+    public PlatformTask<?> runSyncFor(Runnable runnable, Player player) {
+        if (FOLIA) {
+            return new FoliaViaTask(player.getScheduler().run(this, (e) -> runnable.run(), DUMMY_RUNNABLE));
+        }
+        return runSync(() -> {
+            if (player.isOnline()) {
+                runnable.run();
+            }
+        });
+    }
+
     @Override
     public PlatformTask runRepeatingSync(Runnable runnable, long period) {
+        if (FOLIA) {
+            return new FoliaViaTask(getServer().getGlobalRegionScheduler().runAtFixedRate(this, (e) -> runnable.run(), 1, period));
+        }
         return new BukkitViaTask(getServer().getScheduler().runTaskTimer(this, runnable, 0, period));
     }
 

bukkit/src/main/java/com/viaversion/viaversion/bukkit/handlers/BukkitDecodeHandler.java

@@ -22,6 +22,7 @@ import com.viaversion.viaversion.bukkit.util.NMSUtil;
 import com.viaversion.viaversion.exception.CancelCodecException;
 import com.viaversion.viaversion.exception.CancelDecoderException;
 import com.viaversion.viaversion.exception.InformativeException;
+import com.viaversion.viaversion.util.ByteBufUtil;
 import com.viaversion.viaversion.util.PipelineUtil;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandler;
@@ -39,7 +40,7 @@ public final class BukkitDecodeHandler extends MessageToMessageDecoder<ByteBuf>
     }
 
     @Override
-    protected void decode(final ChannelHandlerContext ctx, final ByteBuf bytebuf, final List<Object> out) throws Exception {
+    protected void decode(final ChannelHandlerContext ctx, final ByteBuf bytebuf, final List<Object> out) {
         if (!connection.checkServerboundPacket()) {
             throw CancelDecoderException.generate(null);
         }
@@ -48,7 +49,7 @@ public final class BukkitDecodeHandler extends MessageToMessageDecoder<ByteBuf>
             return;
         }
 
-        final ByteBuf transformedBuf = ctx.alloc().buffer().writeBytes(bytebuf);
+        final ByteBuf transformedBuf = ByteBufUtil.copy(ctx.alloc(), bytebuf);
         try {
             connection.transformIncoming(transformedBuf, CancelDecoderException::generate);
             out.add(transformedBuf.retain());

bukkit/src/main/java/com/viaversion/viaversion/bukkit/handlers/BukkitEncodeHandler.java

@@ -22,6 +22,7 @@ import com.viaversion.viaversion.bukkit.util.NMSUtil;
 import com.viaversion.viaversion.exception.CancelCodecException;
 import com.viaversion.viaversion.exception.CancelEncoderException;
 import com.viaversion.viaversion.exception.InformativeException;
+import com.viaversion.viaversion.util.ByteBufUtil;
 import com.viaversion.viaversion.util.PipelineUtil;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandler;
@@ -52,7 +53,7 @@ public final class BukkitEncodeHandler extends MessageToMessageEncoder<ByteBuf>
             return;
         }
 
-        final ByteBuf transformedBuf = ctx.alloc().buffer().writeBytes(bytebuf);
+        final ByteBuf transformedBuf = ByteBufUtil.copy(ctx.alloc(), bytebuf);
         try {
             final boolean needsCompression = !handledCompression && handleCompressionOrder(ctx, transformedBuf);
             connection.transformClientbound(transformedBuf, CancelEncoderException::generate);

bukkit/src/main/java/com/viaversion/viaversion/bukkit/listeners/v1_20_5to1_21/LegacyChangeItemListener.java

@@ -0,0 +1,72 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21;
+
+import com.viaversion.viaversion.ViaVersionPlugin;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.protocols.v1_20_5to1_21.storage.EfficiencyAttributeStorage;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.block.BlockDamageEvent;
+import org.bukkit.event.inventory.InventoryCloseEvent;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+
+public class LegacyChangeItemListener extends PlayerChangeItemListener {
+
+    public LegacyChangeItemListener(final ViaVersionPlugin plugin) {
+        super(plugin);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onBlockDamageEvent(final BlockDamageEvent event) {
+        final Player player = event.getPlayer();
+        final ItemStack item = event.getItemInHand();
+        sendAttributeUpdate(player, item, Slot.HAND);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onInventoryClose(final InventoryCloseEvent event) {
+        if (event.getPlayer() instanceof Player player &&
+            (event.getInventory().getType() == InventoryType.CRAFTING ||
+                event.getInventory().getType() == InventoryType.PLAYER)) {
+            sendArmorUpdate(player);
+        }
+    }
+
+    private void sendArmorUpdate(final Player player) {
+        final UserConnection connection = getUserConnection(player);
+        final EfficiencyAttributeStorage storage = getEfficiencyStorage(connection);
+        if (storage == null) {
+            return;
+        }
+
+        final PlayerInventory inventory = player.getInventory();
+        final ItemStack helmet = inventory.getHelmet();
+        final ItemStack leggings = swiftSneak != null ? inventory.getLeggings() : null;
+        final ItemStack boots = depthStrider != null ? inventory.getBoots() : null;
+
+        storage.setEnchants(player.getEntityId(), connection, storage.activeEnchants()
+            .aquaAffinity(helmet != null ? helmet.getEnchantmentLevel(aquaAffinity) : 0)
+            .swiftSneak(leggings != null ? leggings.getEnchantmentLevel(swiftSneak) : 0)
+            .depthStrider(boots != null ? boots.getEnchantmentLevel(depthStrider) : 0));
+    }
+
+}

bukkit/src/main/java/com/viaversion/viaversion/bukkit/listeners/v1_20_5to1_21/PlayerChangeItemListener.java

@@ -18,7 +18,6 @@
 package com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21;
 
 import com.viaversion.viaversion.ViaVersionPlugin;
-import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.Protocol1_20_5To1_21;
@@ -38,11 +37,11 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public class PlayerChangeItemListener extends ViaBukkitListener {
 
     // Use legacy function and names here to support all versions
-    private final Enchantment efficiency = getByName("efficiency", "DIG_SPEED");
-    private final Enchantment aquaAffinity = getByName("aqua_affinity", "WATER_WORKER");
-    private final Enchantment depthStrider = getByName("depth_strider", "DEPTH_STRIDER");
-    private final Enchantment soulSpeed = getByName("soul_speed", "SOUL_SPEED");
-    private final Enchantment swiftSneak = getByName("swift_sneak", "SWIFT_SNEAK");
+    protected final Enchantment efficiency = getByName("efficiency", "DIG_SPEED");
+    protected final Enchantment aquaAffinity = getByName("aqua_affinity", "WATER_WORKER");
+    protected final Enchantment depthStrider = getByName("depth_strider", "DEPTH_STRIDER");
+    protected final Enchantment soulSpeed = getByName("soul_speed", "SOUL_SPEED");
+    protected final Enchantment swiftSneak = getByName("swift_sneak", "SWIFT_SNEAK");
 
     public PlayerChangeItemListener(final ViaVersionPlugin plugin) {
         super(plugin, Protocol1_20_5To1_21.class);
@@ -55,35 +54,26 @@ public class PlayerChangeItemListener extends ViaBukkitListener {
         sendAttributeUpdate(player, item, Slot.HAND);
     }
 
+    protected EfficiencyAttributeStorage getEfficiencyStorage(final UserConnection connection) {
+        return connection != null ? connection.get(EfficiencyAttributeStorage.class) : null;
+    }
+
     void sendAttributeUpdate(final Player player, @Nullable final ItemStack item, final Slot slot) {
-        final UserConnection connection = Via.getAPI().getConnection(player.getUniqueId());
-        if (connection == null || !isOnPipe(player)) {
-            return;
-        }
+        final UserConnection connection = getUserConnection(player);
+        final EfficiencyAttributeStorage storage = getEfficiencyStorage(connection);
+        if (storage == null) return;
 
-        final EfficiencyAttributeStorage storage = connection.get(EfficiencyAttributeStorage.class);
-        if (storage == null) {
-            return;
-        }
-
-        final EfficiencyAttributeStorage.ActiveEnchants activeEnchants = storage.activeEnchants();
-        int efficiencyLevel = activeEnchants.efficiency().level();
-        int aquaAffinityLevel = activeEnchants.aquaAffinity().level();
-        int soulSpeedLevel = activeEnchants.soulSpeed().level();
-        int swiftSneakLevel = activeEnchants.swiftSneak().level();
-        int depthStriderLevel = activeEnchants.depthStrider().level();
-        switch (slot) {
-            case HAND -> efficiencyLevel = item != null ? item.getEnchantmentLevel(efficiency) : 0;
-            case HELMET -> aquaAffinityLevel = item != null ? item.getEnchantmentLevel(aquaAffinity) : 0;
-            case LEGGINGS -> swiftSneakLevel = item != null && swiftSneak != null ? item.getEnchantmentLevel(swiftSneak) : 0;
-            case BOOTS -> {
-                depthStriderLevel = item != null && depthStrider != null ? item.getEnchantmentLevel(depthStrider) : 0;
-                // TODO This needs continuous ticking for the supporting block as a conditional effect
-                //  and is even more prone to desync from high ping than the other attributes
-                //soulSpeedLevel = item != null && soulSpeed != null ? item.getEnchantmentLevel(soulSpeed) : 0;
-            }
-        }
-        storage.setEnchants(player.getEntityId(), connection, efficiencyLevel, soulSpeedLevel, swiftSneakLevel, aquaAffinityLevel, depthStriderLevel);
+        EfficiencyAttributeStorage.ActiveEnchants enchants = storage.activeEnchants();
+        enchants = switch (slot) {
+            case HAND -> enchants.efficiency(item != null ? item.getEnchantmentLevel(efficiency) : 0);
+            case HELMET -> enchants.aquaAffinity(item != null ? item.getEnchantmentLevel(aquaAffinity) : 0);
+            case LEGGINGS -> enchants.swiftSneak(item != null && swiftSneak != null ? item.getEnchantmentLevel(swiftSneak) : 0);
+            case BOOTS -> enchants.depthStrider(item != null && depthStrider != null ? item.getEnchantmentLevel(depthStrider) : 0);
+            // TODO This needs continuous ticking for the supporting block as a conditional effect
+            //  and is even more prone to desync from high ping than the other attributes
+            //soulSpeedLevel = item != null && soulSpeed != null ? item.getEnchantmentLevel(soulSpeed) : 0;
+        };
+        storage.setEnchants(player.getEntityId(), connection, enchants);
     }
 
     enum Slot {

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/BukkitViaLoader.java

@@ -26,23 +26,25 @@ import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import com.viaversion.viaversion.bukkit.listeners.UpdateListener;
 import com.viaversion.viaversion.bukkit.listeners.multiversion.PlayerSneakListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_14_4to1_15.EntityToggleGlideListener;
-import com.viaversion.viaversion.bukkit.listeners.v1_19_3to1_19_4.ArmorToggleListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_18_2to1_19.BlockBreakListener;
+import com.viaversion.viaversion.bukkit.listeners.v1_19_3to1_19_4.ArmorToggleListener;
+import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.LegacyChangeItemListener;
+import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.PaperPlayerChangeItemListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.ArmorListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.BlockListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.DeathListener;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.HandItemCache;
 import com.viaversion.viaversion.bukkit.listeners.v1_8to1_9.PaperPatch;
-import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.PaperPlayerChangeItemListener;
-import com.viaversion.viaversion.bukkit.listeners.v1_20_5to1_21.PlayerChangeItemListener;
 import com.viaversion.viaversion.bukkit.providers.BukkitAckSequenceProvider;
 import com.viaversion.viaversion.bukkit.providers.BukkitBlockConnectionProvider;
 import com.viaversion.viaversion.bukkit.providers.BukkitInventoryQuickMoveProvider;
+import com.viaversion.viaversion.bukkit.providers.BukkitPickItemProvider;
 import com.viaversion.viaversion.bukkit.providers.BukkitViaMovementTransmitter;
 import com.viaversion.viaversion.protocols.v1_11_1to1_12.provider.InventoryQuickMoveProvider;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.blockconnections.ConnectionData;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.blockconnections.providers.BlockConnectionProvider;
 import com.viaversion.viaversion.protocols.v1_18_2to1_19.provider.AckSequenceProvider;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.provider.PickItemProvider;
 import com.viaversion.viaversion.protocols.v1_8to1_9.provider.HandItemProvider;
 import com.viaversion.viaversion.protocols.v1_8to1_9.provider.MovementTransmitterProvider;
 import java.util.HashSet;
@@ -184,7 +186,12 @@ public class BukkitViaLoader implements ViaPlatformLoader {
             if (PaperViaInjector.hasClass("io.papermc.paper.event.player.PlayerInventorySlotChangeEvent")) {
                 new PaperPlayerChangeItemListener(plugin).register();
             } else {
-                new PlayerChangeItemListener(plugin).register();
+                new LegacyChangeItemListener(plugin).register();
+            }
+        }
+        if (serverProtocolVersion.olderThan(ProtocolVersion.v1_21_4)) {
+            if (PaperViaInjector.hasMethod(Material.class, "isItem")) {
+                Via.getManager().getProviders().use(PickItemProvider.class, new BukkitPickItemProvider(plugin));
             }
         }
     }

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/FoliaViaTask.java

@@ -0,0 +1,28 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.bukkit.platform;
+
+import com.viaversion.viaversion.api.platform.PlatformTask;
+import io.papermc.paper.threadedregions.scheduler.ScheduledTask;
+
+public record FoliaViaTask(ScheduledTask task) implements PlatformTask<ScheduledTask> {
+    @Override
+    public void cancel() {
+        task.cancel();
+    }
+}

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/PaperViaInjector.java

@@ -65,12 +65,7 @@ public final class PaperViaInjector {
     }
 
     private static boolean hasServerProtocolMethod() {
-        try {
-            Class.forName("org.bukkit.UnsafeValues").getDeclaredMethod("getProtocolVersion");
-            return true;
-        } catch (final ClassNotFoundException | NoSuchMethodException e) {
-            return false;
-        }
+        return hasMethod("org.bukkit.UnsafeValues", "getProtocolVersion");
     }
 
     private static boolean hasPaperInjectionMethod() {
@@ -78,12 +73,7 @@ public final class PaperViaInjector {
     }
 
     private static boolean hasIsStoppingMethod() {
-        try {
-            Bukkit.class.getDeclaredMethod("isStopping");
-            return true;
-        } catch (final NoSuchMethodException e) {
-            return false;
-        }
+        return hasMethod(Bukkit.class, "isStopping");
     }
 
     private static boolean hasPacketLimiter() {
@@ -98,4 +88,22 @@ public final class PaperViaInjector {
             return false;
         }
     }
+
+    public static boolean hasMethod(final String className, final String method) {
+        try {
+            Class.forName(className).getDeclaredMethod(method);
+            return true;
+        } catch (final ClassNotFoundException | NoSuchMethodException e) {
+            return false;
+        }
+    }
+
+    public static boolean hasMethod(final Class<?> clazz, final String method, final Class<?>... params) {
+        try {
+            clazz.getDeclaredMethod(method, params);
+            return true;
+        } catch (final NoSuchMethodException e) {
+            return false;
+        }
+    }
 }

bukkit/src/main/java/com/viaversion/viaversion/bukkit/providers/BukkitInventoryQuickMoveProvider.java

@@ -84,7 +84,6 @@ public class BukkitInventoryQuickMoveProvider extends InventoryQuickMoveProvider
             updateTask = new BukkitInventoryUpdateTask(this, uuid);
             updateTasks.put(uuid, updateTask);
         }
-        // http://wiki.vg/index.php?title=Protocol&oldid=13223#Click_Window
         updateTask.addItem(windowId, slotId, actionId);
         if (!registered && Via.getPlatform().isPluginEnabled()) {
             Via.getPlatform().runSync(updateTask);

bukkit/src/main/java/com/viaversion/viaversion/bukkit/providers/BukkitPickItemProvider.java

@@ -0,0 +1,184 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.bukkit.providers;
+
+import com.viaversion.viaversion.ViaVersionPlugin;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.BlockPosition;
+import com.viaversion.viaversion.bukkit.platform.PaperViaInjector;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.provider.PickItemProvider;
+import java.util.UUID;
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemFactory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.inventory.meta.BlockStateMeta;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class BukkitPickItemProvider extends PickItemProvider {
+    private static final boolean HAS_PLACEMENT_MATERIAL_METHOD = PaperViaInjector.hasMethod("org.bukkit.block.data.BlockData", "getPlacementMaterial");
+    private static final boolean HAS_SPAWN_EGG_METHOD = PaperViaInjector.hasMethod(ItemFactory.class, "getSpawnEgg", EntityType.class);
+    private static final double BLOCK_RANGE = 4.5 + 1;
+    private static final double BLOCK_RANGE_SQUARED = BLOCK_RANGE * BLOCK_RANGE;
+    private static final double ENTITY_RANGE = 3 + 3;
+    private final ViaVersionPlugin plugin;
+
+    public BukkitPickItemProvider(final ViaVersionPlugin plugin) {
+        this.plugin = plugin;
+    }
+
+    @Override
+    public void pickItemFromBlock(final UserConnection connection, final BlockPosition blockPosition, final boolean includeData) {
+        final UUID uuid = connection.getProtocolInfo().getUuid();
+        final Player player = plugin.getServer().getPlayer(uuid);
+        if (player == null) {
+            return;
+        }
+
+        plugin.runSyncFor(() -> {
+            final Location playerLocation = player.getLocation();
+            if (blockPosition.distanceFromCenterSquared(playerLocation.getX(), playerLocation.getY(), playerLocation.getZ()) > BLOCK_RANGE_SQUARED) {
+                return;
+            }
+
+            final Block block = player.getWorld().getBlockAt(blockPosition.x(), blockPosition.y(), blockPosition.z());
+            if (block.getType() == Material.AIR) {
+                return;
+            }
+
+            final ItemStack item = blockToItem(block, includeData && player.getGameMode() == GameMode.CREATIVE);
+            if (item != null) {
+                pickItem(player, item);
+            }
+        }, player);
+    }
+
+    private @Nullable ItemStack blockToItem(final Block block, final boolean includeData) {
+        if (HAS_PLACEMENT_MATERIAL_METHOD) {
+            final ItemStack item = new ItemStack(block.getBlockData().getPlacementMaterial(), 1);
+            if (includeData && item.getItemMeta() instanceof final BlockStateMeta blockStateMeta) {
+                blockStateMeta.setBlockState(block.getState());
+                item.setItemMeta(blockStateMeta);
+            }
+            return item;
+        } else if (block.getType().isItem()) {
+            return new ItemStack(block.getType(), 1);
+        }
+        return null;
+    }
+
+    @Override
+    public void pickItemFromEntity(final UserConnection connection, final int entityId, final boolean includeData) {
+        if (!HAS_SPAWN_EGG_METHOD) {
+            return;
+        }
+
+        final UUID uuid = connection.getProtocolInfo().getUuid();
+        final Player player = plugin.getServer().getPlayer(uuid);
+        if (player == null) {
+            return;
+        }
+
+        plugin.runSyncFor(() -> {
+            final Entity entity = player.getWorld().getNearbyEntities(player.getLocation(), ENTITY_RANGE, ENTITY_RANGE, ENTITY_RANGE).stream()
+                .filter(e -> e.getEntityId() == entityId)
+                .findAny()
+                .orElse(null);
+            if (entity == null) {
+                return;
+            }
+
+            final Material spawnEggType = Bukkit.getItemFactory().getSpawnEgg(entity.getType());
+            if (spawnEggType != null) {
+                pickItem(player, new ItemStack(spawnEggType, 1));
+            }
+        }, player);
+    }
+
+    private void pickItem(final Player player, final ItemStack item) {
+        // Find matching item
+        final PlayerInventory inventory = player.getInventory();
+        final ItemStack[] contents = inventory.getStorageContents();
+        int sourceSlot = -1;
+        for (int i = 0; i < contents.length; i++) {
+            final ItemStack content = contents[i];
+            if (content == null || !content.isSimilar(item)) {
+                continue;
+            }
+
+            sourceSlot = i;
+            break;
+        }
+
+        if (sourceSlot != -1) {
+            moveToHotbar(inventory, sourceSlot, contents);
+        } else if (player.getGameMode() == GameMode.CREATIVE) {
+            spawnItem(item, inventory, contents);
+        }
+    }
+
+    private void spawnItem(final ItemStack item, final PlayerInventory inventory, final ItemStack[] contents) {
+        final int targetSlot = findEmptyHotbarSlot(inventory, inventory.getHeldItemSlot());
+        inventory.setHeldItemSlot(targetSlot);
+        final ItemStack heldItem = inventory.getItem(targetSlot);
+        int emptySlot = targetSlot;
+        if (heldItem != null && heldItem.getType() != Material.AIR) {
+            // Swap to the first free slot in the inventory, else add it to the current hotbar slot
+            for (int i = 0; i < contents.length; i++) {
+                if (contents[i] == null || contents[i].getType() == Material.AIR) {
+                    emptySlot = i;
+                    break;
+                }
+            }
+        }
+
+        inventory.setItem(emptySlot, heldItem);
+        inventory.setItemInMainHand(item);
+    }
+
+    private void moveToHotbar(final PlayerInventory inventory, final int sourceSlot, final ItemStack[] contents) {
+        if (sourceSlot < 9) {
+            inventory.setHeldItemSlot(sourceSlot);
+            return;
+        }
+
+        final int heldSlot = inventory.getHeldItemSlot();
+        final int targetSlot = findEmptyHotbarSlot(inventory, heldSlot);
+        inventory.setHeldItemSlot(targetSlot);
+        final ItemStack heldItem = inventory.getItem(targetSlot);
+        inventory.setItemInMainHand(contents[sourceSlot]);
+        inventory.setItem(sourceSlot, heldItem);
+    }
+
+    private int findEmptyHotbarSlot(final PlayerInventory inventory, final int heldSlot) {
+        for (int i = 0; i < 9; i++) {
+            final ItemStack item = inventory.getItem(i);
+            if (item == null || item.getType() == Material.AIR) {
+                return i;
+            }
+        }
+        return heldSlot;
+    }
+}

common/build.gradle.kts

@@ -18,3 +18,32 @@ java {
 tasks.named<Jar>("sourcesJar") {
     from(project(":viaversion-api").sourceSets.main.get().allSource)
 }
+
+// Task to quickly test/debug code changes using https://github.com/ViaVersion/ViaProxy
+// For further instructions see the ViaProxy repository README
+tasks.register<JavaExec>("runViaProxy") {
+    dependsOn(tasks.shadowJar)
+
+    val viaProxyConfiguration = configurations.create("viaProxy")
+    viaProxyConfiguration.dependencies.add(dependencies.create(rootProject.libs.viaProxy.get().copy().setTransitive(false)))
+
+    mainClass.set("net.raphimc.viaproxy.ViaProxy")
+    classpath = viaProxyConfiguration
+    workingDir = file("run")
+    jvmArgs = listOf("-DskipUpdateCheck")
+
+    if (System.getProperty("viaproxy.gui.autoStart") != null) {
+        jvmArgs("-Dviaproxy.gui.autoStart")
+    }
+
+    doFirst {
+        val jarsDir = file("$workingDir/jars")
+        jarsDir.mkdirs()
+        file("$jarsDir/${project.name}.jar").writeBytes(tasks.shadowJar.get().archiveFile.get().asFile.readBytes())
+    }
+
+    doLast {
+        file("$workingDir/jars/${project.name}.jar").delete()
+        file("$workingDir/logs").deleteRecursively()
+    }
+}

common/src/main/java/com/viaversion/viaversion/ViaListener.java

@@ -48,7 +48,10 @@ public abstract class ViaListener {
      * @return True if on pipe
      */
     protected boolean isOnPipe(UUID uuid) {
-        UserConnection userConnection = getUserConnection(uuid);
+        return isOnPipe(getUserConnection(uuid));
+    }
+
+    protected boolean isOnPipe(UserConnection userConnection) {
         return userConnection != null &&
             (requiredPipeline == null || userConnection.getProtocolInfo().getPipeline().contains(requiredPipeline));
     }

common/src/main/java/com/viaversion/viaversion/ViaManagerImpl.java

@@ -244,9 +244,12 @@ public class ViaManagerImpl implements ViaManager {
         }
 
         if (version < 17) {
-            platform.getLogger().warning("You are running an outdated Java version, please update it to at least Java 17 (your version is " + javaVersion + ").");
+            platform.getLogger().warning("You are running an outdated Java version, please update it to at least Java 21 (your version is " + javaVersion + ").");
             platform.getLogger().warning("ViaVersion no longer officially supports this version of Java, only offering unsupported compatibility builds.");
             platform.getLogger().warning("See https://github.com/ViaVersion/ViaVersion/releases/tag/5.0.0 for more information.");
+        } else if (version < 21) {
+            platform.getLogger().warning("Please update your Java runtime to at least Java 21 (your version is " + javaVersion + ").");
+            platform.getLogger().warning("At some point in the future, ViaVersion will no longer be compatible with this version of Java.");
         }
     }
 

common/src/main/java/com/viaversion/viaversion/commands/defaultsubs/DumpSubCmd.java

@@ -30,7 +30,7 @@ public class DumpSubCmd implements ViaSubCommand {
 
     @Override
     public String description() {
-        return "Dump information about your server, this is helpful if you report bugs.";
+        return "Dump information about your platform implementation, this is helpful if you report bugs.";
     }
 
     @Override

common/src/main/java/com/viaversion/viaversion/commands/defaultsubs/ReloadSubCmd.java

@@ -35,7 +35,7 @@ public class ReloadSubCmd implements ViaSubCommand {
     @Override
     public boolean execute(ViaCommandSender sender, String[] args) {
         Via.getManager().getConfigurationProvider().reloadConfigs();
-        sendMessage(sender, "&6Configuration successfully reloaded! Some features may need a restart.");
+        sendMessage(sender, "&6Configuration successfully reloaded! Some config options may require a restart to take effect.");
         return true;
     }
 }

common/src/main/java/com/viaversion/viaversion/configuration/AbstractViaConfig.java

@@ -164,7 +164,7 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
         handleInvalidItemCount = getBoolean("handle-invalid-item-count", false);
         cancelBlockSounds = getBoolean("cancel-block-sounds", true);
         hideScoreboardNumbers = getBoolean("hide-scoreboard-numbers", false);
-        fix1_21PlacementRotation = getBoolean("fix-1_21-placement-rotation", false);
+        fix1_21PlacementRotation = getBoolean("fix-1_21-placement-rotation", true);
     }
 
     private BlockedProtocolVersions loadBlockedProtocolVersions() {
@@ -554,6 +554,6 @@ public abstract class AbstractViaConfig extends Config implements ViaVersionConf
 
     @Override
     public boolean fix1_21PlacementRotation() {
-        return false && fix1_21PlacementRotation; // TODO Can't always set onGround to true
+        return fix1_21PlacementRotation;
     }
 }

common/src/main/java/com/viaversion/viaversion/connection/UserConnectionImpl.java

@@ -29,8 +29,8 @@ import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.Direction;
 import com.viaversion.viaversion.api.protocol.packet.PacketTracker;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
-import com.viaversion.viaversion.api.protocol.packet.State;
 import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.VarIntType;
 import com.viaversion.viaversion.exception.CancelException;
 import com.viaversion.viaversion.exception.InformativeException;
 import com.viaversion.viaversion.protocol.packet.PacketWrapperImpl;
@@ -55,6 +55,7 @@ import java.util.function.Function;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class UserConnectionImpl implements UserConnection {
+    private static final int PASSTHROUGH_DATA_BYTES = Long.BYTES * 2 + 2;
     private static final AtomicLong IDS = new AtomicLong();
     private final long id = IDS.incrementAndGet();
     private final Map<Class<?>, StorableObject> storedObjects = new ConcurrentHashMap<>();
@@ -244,7 +245,8 @@ public class UserConnectionImpl implements UserConnection {
     }
 
     private void sendRawPacketToServerServerSide(final ByteBuf packet, final boolean currentThread) {
-        final ByteBuf buf = packet.alloc().buffer();
+        final int initialCapacity = active ? packet.readableBytes() + PASSTHROUGH_DATA_BYTES : packet.readableBytes();
+        final ByteBuf buf = packet.alloc().buffer(initialCapacity);
         try {
             // We'll use passing through because there are some encoder wrappers
             ChannelHandlerContext context = PipelineUtil
@@ -333,7 +335,7 @@ public class UserConnectionImpl implements UserConnection {
             return;
         }
 
-        int id = Types.VAR_INT.readPrimitive(buf);
+        final int id = Types.VAR_INT.readPrimitive(buf);
         if (id == PacketWrapper.PASSTHROUGH_ID) {
             if (!passthroughTokens.remove(Types.UUID.read(buf))) {
                 throw new IllegalArgumentException("Invalid token");
@@ -341,20 +343,47 @@ public class UserConnectionImpl implements UserConnection {
             return;
         }
 
-        PacketWrapper wrapper = new PacketWrapperImpl(id, buf, this);
-        State state = protocolInfo.getState(direction);
+        final int valuesReaderIndex = buf.readerIndex();
+        final PacketWrapperImpl wrapper = new PacketWrapperImpl(id, buf, this);
         try {
-            protocolInfo.getPipeline().transform(direction, state, wrapper);
-        } catch (CancelException ex) {
+            protocolInfo.getPipeline().transform(direction, protocolInfo.getState(direction), wrapper);
+        } catch (final CancelException ex) {
             throw cancelSupplier.apply(ex);
         }
 
-        ByteBuf transformed = buf.alloc().buffer();
+        writeToBuffer(wrapper, buf, id, valuesReaderIndex);
+    }
+
+    private void writeToBuffer(final PacketWrapperImpl wrapper, final ByteBuf buf, final int originalId, final int originalReaderIndex) {
+        final int remainingBytes = buf.readableBytes();
+        if (buf.readerIndex() == originalReaderIndex && wrapper.areStoredPacketValuesEmpty()) {
+            if (wrapper.getId() == originalId) {
+                // No changes needed; just set the reader and writer indexes and we're done
+                buf.setIndex(0, originalReaderIndex + remainingBytes);
+                return;
+            }
+            if (VarIntType.varIntLength(wrapper.getId()) == VarIntType.varIntLength(originalId)) {
+                // If the var int encoded length is the same, simply replace the id at the head
+                buf.setIndex(0, 0);
+                Types.VAR_INT.writePrimitive(buf, wrapper.getId());
+                buf.writerIndex(originalReaderIndex + remainingBytes);
+                return;
+            }
+        }
+
+        // Instead of allocating a possible unnecessarily large buffer to write the wrapper contents to,
+        // only allocate the remaining bytes and write the rest to the original buf's head directly.
+        final ByteBuf remainingBuf = buf.alloc().buffer(remainingBytes, remainingBytes);
         try {
-            wrapper.writeToBuffer(transformed);
-            buf.clear().writeBytes(transformed);
+            // Copy before modifying the buffer
+            remainingBuf.writeBytes(buf, remainingBytes);
+
+            // Reset indexes, write wrapper contents, then the unread bytes
+            buf.setIndex(0, 0);
+            wrapper.writeProcessedValues(buf);
+            buf.writeBytes(remainingBuf);
         } finally {
-            transformed.release();
+            remainingBuf.release();
         }
     }
 

common/src/main/java/com/viaversion/viaversion/protocol/ProtocolManagerImpl.java

@@ -76,6 +76,8 @@ import com.viaversion.viaversion.protocols.v1_20_2to1_20_3.Protocol1_20_2To1_20_
 import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.Protocol1_20_3To1_20_5;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.Protocol1_20_5To1_21;
 import com.viaversion.viaversion.protocols.v1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.Protocol1_21_2To1_21_4;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.Protocol1_21To1_21_2;
 import com.viaversion.viaversion.protocols.v1_8to1_9.Protocol1_8To1_9;
 import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.Protocol1_9_1To1_9_3;
 import com.viaversion.viaversion.protocols.v1_9_3to1_10.Protocol1_9_3To1_10;
@@ -192,6 +194,8 @@ public class ProtocolManagerImpl implements ProtocolManager {
         registerProtocol(new Protocol1_20_3To1_20_5(), ProtocolVersion.v1_20_5, ProtocolVersion.v1_20_3);
 
         registerProtocol(new Protocol1_20_5To1_21(), ProtocolVersion.v1_21, ProtocolVersion.v1_20_5);
+        registerProtocol(new Protocol1_21To1_21_2(), ProtocolVersion.v1_21_2, ProtocolVersion.v1_21);
+        registerProtocol(new Protocol1_21_2To1_21_4(), ProtocolVersion.v1_21_4, ProtocolVersion.v1_21_2);
     }
 
     @Override

common/src/main/java/com/viaversion/viaversion/protocol/packet/PacketWrapperImpl.java

@@ -222,6 +222,18 @@ public class PacketWrapperImpl implements PacketWrapper {
 
     @Override
     public void writeToBuffer(ByteBuf buffer) throws InformativeException {
+        writeProcessedValues(buffer);
+        if (inputBuffer != null) {
+            buffer.writeBytes(inputBuffer);
+        }
+    }
+
+    public boolean areStoredPacketValuesEmpty() {
+        // Check for read/added packet values, not the input buffer
+        return packetValues.isEmpty() && readableObjects.isEmpty();
+    }
+
+    public void writeProcessedValues(ByteBuf buffer) throws InformativeException {
         if (id != -1) {
             Types.VAR_INT.writePrimitive(buffer, id);
         }
@@ -238,16 +250,15 @@ public class PacketWrapperImpl implements PacketWrapper {
                 throw createInformativeException(e, packetValue.type(), i);
             }
         }
-        writeRemaining(buffer);
     }
 
     private InformativeException createInformativeException(final Exception cause, final Type<?> type, final int index) {
         return new InformativeException(cause)
+            .set("Packet Type", this.packetType)
             .set("Index", index)
             .set("Type", type.getTypeName())
-            .set("Packet ID", this.id)
-            .set("Packet Type", this.packetType)
-            .set("Data", this.packetValues);
+            .set("Data", this.packetValues)
+            .set("Packet ID", this.id);
     }
 
     @Override
@@ -264,12 +275,6 @@ public class PacketWrapperImpl implements PacketWrapper {
         packetValues.clear();
     }
 
-    private void writeRemaining(ByteBuf output) {
-        if (inputBuffer != null) {
-            output.writeBytes(inputBuffer);
-        }
-    }
-
     @Override
     public void send(Class<? extends Protocol> protocol, boolean skipCurrentPipeline) throws InformativeException {
         send0(protocol, skipCurrentPipeline, true);
@@ -320,7 +325,7 @@ public class PacketWrapperImpl implements PacketWrapper {
         final ProtocolInfo protocolInfo = user().getProtocolInfo();
         final List<Protocol> protocols = protocolInfo.getPipeline().pipes(protocolClass, skipCurrentPipeline, direction);
         apply(direction, protocolInfo.getState(direction), protocols);
-        final ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        final ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             return output.retain();
@@ -354,7 +359,7 @@ public class PacketWrapperImpl implements PacketWrapper {
             return cancelledFuture();
         }
 
-        ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             return user().sendRawPacketFuture(output.retain());
@@ -373,7 +378,7 @@ public class PacketWrapperImpl implements PacketWrapper {
             return;
         }
 
-        ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             if (currentThread) {
@@ -386,6 +391,14 @@ public class PacketWrapperImpl implements PacketWrapper {
         }
     }
 
+    private ByteBuf allocateOutputBuffer() {
+        if (inputBuffer == null) {
+            return user().getChannel().alloc().buffer();
+        }
+        // May have already been partially or fully read
+        return inputBuffer.alloc().buffer(Math.max(inputBuffer.readableBytes(), 256));
+    }
+
     private ChannelFuture cancelledFuture() {
         return user().getChannel().newFailedFuture(new RuntimeException("Tried to send cancelled packet"));
     }
@@ -454,7 +467,7 @@ public class PacketWrapperImpl implements PacketWrapper {
             return;
         }
 
-        ByteBuf output = inputBuffer == null ? user().getChannel().alloc().buffer() : inputBuffer.alloc().buffer();
+        ByteBuf output = allocateOutputBuffer();
         try {
             writeToBuffer(output);
             if (currentThread) {

common/src/main/java/com/viaversion/viaversion/protocols/base/ClientboundLoginPackets.java

@@ -23,11 +23,14 @@ import com.viaversion.viaversion.protocols.base.packet.BaseClientboundPacket;
 public enum ClientboundLoginPackets implements BaseClientboundPacket {
     LOGIN_DISCONNECT, // 0x00
     HELLO, // 0x01
-    GAME_PROFILE, // 0x02
+    LOGIN_FINISHED, // 0x02
     LOGIN_COMPRESSION, // 0x03
     CUSTOM_QUERY, // 0x04
     COOKIE_REQUEST; // 0x05
 
+    @Deprecated(forRemoval = true)
+    public static final ClientboundLoginPackets GAME_PROFILE = LOGIN_FINISHED;
+
     @Override
     public final int getId() {
         return ordinal();

common/src/main/java/com/viaversion/viaversion/protocols/base/v1_7/ClientboundBaseProtocol1_7.java

@@ -128,7 +128,7 @@ public class ClientboundBaseProtocol1_7 extends AbstractProtocol<BaseClientbound
         });
 
         // Track player name/uuid and setup connection + track state
-        registerClientbound(ClientboundLoginPackets.GAME_PROFILE, wrapper -> {
+        registerClientbound(ClientboundLoginPackets.LOGIN_FINISHED, wrapper -> {
             final ProtocolInfo info = wrapper.user().getProtocolInfo();
 
             if (info.serverProtocolVersion().olderThan(ProtocolVersion.v1_16)) {

common/src/main/java/com/viaversion/viaversion/protocols/template/BlockItemPacketRewriter1_99.java

@@ -18,27 +18,26 @@
 package com.viaversion.viaversion.protocols.template;
 
 import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_20_2;
-import com.viaversion.viaversion.api.type.types.version.Types1_21;
-import com.viaversion.viaversion.protocols.v1_20_2to1_20_3.rewriter.RecipeRewriter1_20_3;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPacket1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPackets1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPacket1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPackets1_21;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPacket1_21_4;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPackets1_21_4;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPackets1_21_2;
 import com.viaversion.viaversion.rewriter.BlockRewriter;
+import com.viaversion.viaversion.rewriter.RecipeDisplayRewriter;
 import com.viaversion.viaversion.rewriter.StructuredItemRewriter;
 
 // To replace if needed:
 //   ChunkType1_20_2
-//   RecipeRewriter1_20_3
-//   Types1_21, Types1_OLD
-final class BlockItemPacketRewriter1_99 extends StructuredItemRewriter<ClientboundPacket1_21, ServerboundPacket1_20_5, Protocol1_99To_98> {
+//   RecipeDisplayRewriter
+//   Types1_21_4, Types1_OLD
+final class BlockItemPacketRewriter1_99 extends StructuredItemRewriter<ClientboundPacket1_21_2, ServerboundPacket1_21_4, Protocol1_99To_98> {
 
     public BlockItemPacketRewriter1_99(final Protocol1_99To_98 protocol) {
-        super(protocol, Types1_21.ITEM, Types1_21.ITEM_ARRAY);
+        super(protocol, Types1_21_4.ITEM, Types1_21_4.ITEM_ARRAY);
         /*super(protocol,
-            Types1_OLD.ITEM, Types1_OLD.ITEM_ARRAY, Types1_21.ITEM, Types1_21.ITEM_ARRAY,
-            Types1_OLD.ITEM_COST, Types1_OLD.OPTIONAL_ITEM_COST, Types1_21.ITEM_COST, Types1_21.OPTIONAL_ITEM_COST,
-            Types1_OLD.PARTICLE, Types1_21.PARTICLE
+            Types1_OLD.ITEM, Types1_OLD.ITEM_ARRAY, Types1_21_4.ITEM, Types1_21_4.ITEM_ARRAY,
+            Types1_OLD.ITEM_COST, Types1_OLD.OPTIONAL_ITEM_COST, Types1_21_4.ITEM_COST, Types1_21_4.OPTIONAL_ITEM_COST
         );*/
     }
 
@@ -47,31 +46,33 @@ final class BlockItemPacketRewriter1_99 extends StructuredItemRewriter<Clientbou
         // Register block and block state id changes
         // Other places using block state id mappings: Spawn particle, entity data, entity spawn (falling blocks)
         // Tags and statistics use block (!) ids
-        final BlockRewriter<ClientboundPacket1_21> blockRewriter = BlockRewriter.for1_20_2(protocol);
-        blockRewriter.registerBlockEvent(ClientboundPackets1_21.BLOCK_EVENT);
-        blockRewriter.registerBlockUpdate(ClientboundPackets1_21.BLOCK_UPDATE);
-        blockRewriter.registerSectionBlocksUpdate1_20(ClientboundPackets1_21.SECTION_BLOCKS_UPDATE);
-        blockRewriter.registerLevelEvent1_21(ClientboundPackets1_21.LEVEL_EVENT, 2001);
-        blockRewriter.registerLevelChunk1_19(ClientboundPackets1_21.LEVEL_CHUNK_WITH_LIGHT, ChunkType1_20_2::new);
-        blockRewriter.registerBlockEntityData(ClientboundPackets1_21.BLOCK_ENTITY_DATA);
+        final BlockRewriter<ClientboundPacket1_21_2> blockRewriter = BlockRewriter.for1_20_2(protocol);
+        blockRewriter.registerBlockEvent(ClientboundPackets1_21_2.BLOCK_EVENT);
+        blockRewriter.registerBlockUpdate(ClientboundPackets1_21_2.BLOCK_UPDATE);
+        blockRewriter.registerSectionBlocksUpdate1_20(ClientboundPackets1_21_2.SECTION_BLOCKS_UPDATE);
+        blockRewriter.registerLevelEvent1_21(ClientboundPackets1_21_2.LEVEL_EVENT, 2001);
+        blockRewriter.registerLevelChunk1_19(ClientboundPackets1_21_2.LEVEL_CHUNK_WITH_LIGHT, ChunkType1_20_2::new);
+        blockRewriter.registerBlockEntityData(ClientboundPackets1_21_2.BLOCK_ENTITY_DATA);
 
         // Registers item id changes
         // Other places using item ids are: Entity data, tags, statistics, effect
-        // registerOpenWindow(ClientboundPackets1_21.OPEN_WINDOW); - If a new container type was added
-        registerCooldown(ClientboundPackets1_21.COOLDOWN);
-        registerSetContent1_17_1(ClientboundPackets1_21.CONTAINER_SET_CONTENT);
-        registerSetSlot1_17_1(ClientboundPackets1_21.CONTAINER_SET_SLOT);
-        registerAdvancements1_20_3(ClientboundPackets1_21.UPDATE_ADVANCEMENTS);
-        registerSetEquipment(ClientboundPackets1_21.SET_EQUIPMENT);
-        registerContainerClick1_17_1(ServerboundPackets1_20_5.CONTAINER_CLICK);
-        registerMerchantOffers1_20_5(ClientboundPackets1_21.MERCHANT_OFFERS);
-        registerSetCreativeModeSlot(ServerboundPackets1_20_5.SET_CREATIVE_MODE_SLOT);
-        registerLevelParticles1_20_5(ClientboundPackets1_21.LEVEL_PARTICLES);
-        registerExplosion(ClientboundPackets1_21.EXPLODE); // Rewrites the included sound and particles
+        // registerOpenScreen(ClientboundPackets1_21_2.OPEN_SCREEN); If a new container type was added; also remove from the component rewriter registration
+        protocol.registerClientbound(ClientboundPackets1_21_2.SET_CURSOR_ITEM, this::passthroughClientboundItem);
+        registerSetPlayerInventory(ClientboundPackets1_21_2.SET_PLAYER_INVENTORY);
+        registerCooldown1_21_2(ClientboundPackets1_21_2.COOLDOWN);
+        registerSetContent1_21_2(ClientboundPackets1_21_2.CONTAINER_SET_CONTENT);
+        registerSetSlot1_21_2(ClientboundPackets1_21_2.CONTAINER_SET_SLOT);
+        registerAdvancements1_20_3(ClientboundPackets1_21_2.UPDATE_ADVANCEMENTS);
+        registerSetEquipment(ClientboundPackets1_21_2.SET_EQUIPMENT);
+        registerMerchantOffers1_20_5(ClientboundPackets1_21_2.MERCHANT_OFFERS);
+        registerContainerClick1_21_2(ServerboundPackets1_21_4.CONTAINER_CLICK);
+        registerSetCreativeModeSlot(ServerboundPackets1_21_4.SET_CREATIVE_MODE_SLOT);
 
-        new RecipeRewriter1_20_3<>(protocol).register1_20_5(ClientboundPackets1_21.UPDATE_RECIPES);
+        final RecipeDisplayRewriter<ClientboundPacket1_21_2> recipeRewriter = new RecipeDisplayRewriter<>(protocol);
+        recipeRewriter.registerUpdateRecipes(ClientboundPackets1_21_2.UPDATE_RECIPES);
+        recipeRewriter.registerRecipeBookAdd(ClientboundPackets1_21_2.RECIPE_BOOK_ADD);
+        recipeRewriter.registerPlaceGhostRecipe(ClientboundPackets1_21_2.PLACE_GHOST_RECIPE);
         // OR do this if serialization of recipes changed and override the relevant method
-        // Add new serializers to RecipeRewriter, or extend the last one for changes
-        // new RecipeRewriter1_20_3<ClientboundPacket1_21>(this) {}.register1_20_5(ClientboundPackets1_21.DECLARE_RECIPES);
+        // Add new serializers to RecipeDisplayRewriter, or extend the last one for changes
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/template/ComponentRewriter1_99.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viaversion.protocols.template;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.util.SerializerVersion;
+
+final class ComponentRewriter1_99 extends ComponentRewriter<ClientboundPacket1_21_2> {
+
+    public ComponentRewriter1_99(final Protocol1_99To_98 protocol) {
+        super(protocol, ReadType.NBT);
+    }
+
+    @Override
+    protected void handleShowItem(final UserConnection connection, final CompoundTag itemTag, final CompoundTag componentsTag) {
+        super.handleShowItem(connection, itemTag, componentsTag);
+        if (componentsTag == null) {
+            return;
+        }
+
+        // Remove or update data from componentsTag
+    }
+
+    @Override
+    protected SerializerVersion inputSerializerVersion() {
+        return SerializerVersion.V1_21_4;
+    }
+}

common/src/main/java/com/viaversion/viaversion/protocols/template/EntityPacketRewriter1_99.java

@@ -17,22 +17,20 @@
  */
 package com.viaversion.viaversion.protocols.template;
 
-import com.viaversion.viaversion.api.minecraft.RegistryEntry;
 import com.viaversion.viaversion.api.minecraft.entities.EntityType;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_20_5;
-import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_21_4;
 import com.viaversion.viaversion.api.type.Types;
-import com.viaversion.viaversion.api.type.types.version.Types1_21;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundConfigurationPackets1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPacket1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPackets1_21;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPackets1_21_2;
 import com.viaversion.viaversion.rewriter.EntityRewriter;
-import com.viaversion.viaversion.util.Key;
+import com.viaversion.viaversion.rewriter.RegistryDataRewriter;
 
 // Replace if needed
 //  Types1_OLD
-//  Types1_21
-final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_21, Protocol1_99To_98> {
+//  Types1_21_4
+final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_21_2, Protocol1_99To_98> {
 
     public EntityPacketRewriter1_99(final Protocol1_99To_98 protocol) {
         super(protocol);
@@ -41,36 +39,32 @@ final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_2
     @Override
     public void registerPackets() {
         // Tracks entities, applies entity data rewrites registered below, untracks entities
-        registerTrackerWithData1_19(ClientboundPackets1_21.ADD_ENTITY, EntityTypes1_20_5.FALLING_BLOCK);
-        registerSetEntityData(ClientboundPackets1_21.SET_ENTITY_DATA, /*Types1_OLD_ENTITY_DATA_LIST, */Types1_21.ENTITY_DATA_LIST); // Specify old and new entity data list if changed
-        registerRemoveEntities(ClientboundPackets1_21.REMOVE_ENTITIES);
+        registerTrackerWithData1_19(ClientboundPackets1_21_2.ADD_ENTITY, EntityTypes1_21_4.FALLING_BLOCK);
+        registerSetEntityData(ClientboundPackets1_21_2.SET_ENTITY_DATA, /*Types1_OLD_ENTITY_DATA_LIST, */Types1_21_4.ENTITY_DATA_LIST); // Specify old and new entity data list if changed
+        registerRemoveEntities(ClientboundPackets1_21_2.REMOVE_ENTITIES);
 
-        protocol.registerClientbound(ClientboundConfigurationPackets1_21.REGISTRY_DATA, wrapper -> {
-            final String registryKey = Key.stripMinecraftNamespace(wrapper.passthrough(Types.STRING));
-            final RegistryEntry[] entries = wrapper.passthrough(Types.REGISTRY_ENTRY_ARRAY);
-            handleRegistryData1_20_5(wrapper.user(), registryKey, entries); // Caches dimensions to access data like height later and tracks the amount of biomes sent for chunk data
+        final RegistryDataRewriter registryDataRewriter = new RegistryDataRewriter(protocol);
+        protocol.registerClientbound(ClientboundConfigurationPackets1_21.REGISTRY_DATA, registryDataRewriter::handle);
+
+        protocol.registerClientbound(ClientboundPackets1_21_2.LOGIN, wrapper -> {
+            final int entityId = wrapper.passthrough(Types.INT); // Entity id
+            wrapper.passthrough(Types.BOOLEAN); // Hardcore
+            wrapper.passthrough(Types.STRING_ARRAY); // World List
+            wrapper.passthrough(Types.VAR_INT); // Max players
+            wrapper.passthrough(Types.VAR_INT); // View distance
+            wrapper.passthrough(Types.VAR_INT); // Simulation distance
+            wrapper.passthrough(Types.BOOLEAN); // Reduced debug info
+            wrapper.passthrough(Types.BOOLEAN); // Show death screen
+            wrapper.passthrough(Types.BOOLEAN); // Limited crafting
+
+            final int dimensionId = wrapper.passthrough(Types.VAR_INT);
+            final String world = wrapper.passthrough(Types.STRING);
+            trackWorldDataByKey1_20_5(wrapper.user(), dimensionId, world);
+
+            trackPlayer(wrapper.user(), entityId);
         });
 
-        protocol.registerClientbound(ClientboundPackets1_21.LOGIN, new PacketHandlers() {
-            @Override
-            public void register() {
-                map(Types.INT); // Entity id
-                map(Types.BOOLEAN); // Hardcore
-                map(Types.STRING_ARRAY); // World List
-                map(Types.VAR_INT); // Max players
-                map(Types.VAR_INT); // View distance
-                map(Types.VAR_INT); // Simulation distance
-                map(Types.BOOLEAN); // Reduced debug info
-                map(Types.BOOLEAN); // Show death screen
-                map(Types.BOOLEAN); // Limited crafting
-                map(Types.VAR_INT); // Dimension id
-                map(Types.STRING); // World
-                handler(worldDataTrackerHandlerByKey1_20_5(3)); // Tracks world height and name for chunk data and entity (un)tracking
-                handler(playerTrackerHandler());
-            }
-        });
-
-        protocol.registerClientbound(ClientboundPackets1_21.RESPAWN, wrapper -> {
+        protocol.registerClientbound(ClientboundPackets1_21_2.RESPAWN, wrapper -> {
             final int dimensionId = wrapper.passthrough(Types.VAR_INT);
             final String world = wrapper.passthrough(Types.STRING);
             trackWorldDataByKey1_20_5(wrapper.user(), dimensionId, world); // Tracks world height and name for chunk data and entity (un)tracking
@@ -85,20 +79,20 @@ final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_2
             if (id >= SomeAddedIndex) {
                 id++;
             }
-            return Types1_21.ENTITY_DATA_TYPES.byId(id);
+            return Types1_21_4.ENTITY_DATA_TYPES.byId(id);
         });*/
 
         // Registers registry type id changes
         registerEntityDataTypeHandler(
-            Types1_21.ENTITY_DATA_TYPES.itemType,
-            Types1_21.ENTITY_DATA_TYPES.blockStateType,
-            Types1_21.ENTITY_DATA_TYPES.optionalBlockStateType,
-            Types1_21.ENTITY_DATA_TYPES.particleType,
-            Types1_21.ENTITY_DATA_TYPES.particlesType,
-            Types1_21.ENTITY_DATA_TYPES.componentType,
-            Types1_21.ENTITY_DATA_TYPES.optionalComponentType
+            Types1_21_4.ENTITY_DATA_TYPES.itemType,
+            Types1_21_4.ENTITY_DATA_TYPES.blockStateType,
+            Types1_21_4.ENTITY_DATA_TYPES.optionalBlockStateType,
+            Types1_21_4.ENTITY_DATA_TYPES.particleType,
+            Types1_21_4.ENTITY_DATA_TYPES.particlesType,
+            Types1_21_4.ENTITY_DATA_TYPES.componentType,
+            Types1_21_4.ENTITY_DATA_TYPES.optionalComponentType
         );
-        registerBlockStateHandler(EntityTypes1_20_5.ABSTRACT_MINECART, 11);
+        registerBlockStateHandler(EntityTypes1_21_4.ABSTRACT_MINECART, 11);
     }
 
     @Override
@@ -109,6 +103,6 @@ final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPacket1_2
 
     @Override
     public EntityType typeFromId(final int type) {
-        return EntityTypes1_20_5.getTypeFromId(type);
+        return EntityTypes1_21_4.getTypeFromId(type);
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/template/Protocol1_99To_98.java

@@ -20,18 +20,21 @@ package com.viaversion.viaversion.protocols.template;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.data.MappingData;
 import com.viaversion.viaversion.api.data.MappingDataBase;
-import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_20_5;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_21_4;
 import com.viaversion.viaversion.api.protocol.AbstractProtocol;
 import com.viaversion.viaversion.api.protocol.packet.provider.PacketTypesProvider;
 import com.viaversion.viaversion.api.protocol.packet.provider.SimplePacketTypesProvider;
+import com.viaversion.viaversion.api.type.types.version.Types1_21_4;
 import com.viaversion.viaversion.data.entity.EntityTrackerBase;
 import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundConfigurationPackets1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPacket1_20_5;
-import com.viaversion.viaversion.protocols.v1_20_3to1_20_5.packet.ServerboundPackets1_20_5;
 import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundConfigurationPackets1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPacket1_21;
-import com.viaversion.viaversion.protocols.v1_20_5to1_21.packet.ClientboundPackets1_21;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPacket1_21_4;
+import com.viaversion.viaversion.protocols.v1_21_2to1_21_4.packet.ServerboundPackets1_21_4;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPacket1_21_2;
+import com.viaversion.viaversion.protocols.v1_21to1_21_2.packet.ClientboundPackets1_21_2;
 import com.viaversion.viaversion.rewriter.AttributeRewriter;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
 import com.viaversion.viaversion.rewriter.SoundRewriter;
 import com.viaversion.viaversion.rewriter.StatisticsRewriter;
 import com.viaversion.viaversion.rewriter.TagRewriter;
@@ -40,35 +43,56 @@ import static com.viaversion.viaversion.util.ProtocolUtil.packetTypeMap;
 
 // Placeholders to replace (in the entire package):
 //   Protocol1_99To_98, EntityPacketRewriter1_99, BlockItemPacketRewriter1_99 - move the latter two to a rewriter package
-//   ClientboundPacket1_21
-//   ServerboundPacket1_20_5
-//   EntityTypes1_20_5 (MAPPED type)
+//   ClientboundPacket1_21_2
+//   ServerboundPacket1_21_4
+//   EntityTypes1_21_4 (MAPPED type)
+//   Types1_21_4.PARTICLE
 //   1.99, 1.98
-final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, ClientboundPacket1_21, ServerboundPacket1_20_5, ServerboundPacket1_20_5> {
+final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21_2, ClientboundPacket1_21_2, ServerboundPacket1_21_4, ServerboundPacket1_21_4> {
 
     public static final MappingData MAPPINGS = new MappingDataBase("1.98", "1.99");
     private final EntityPacketRewriter1_99 entityRewriter = new EntityPacketRewriter1_99(this);
     private final BlockItemPacketRewriter1_99 itemRewriter = new BlockItemPacketRewriter1_99(this);
-    private final TagRewriter<ClientboundPacket1_21> tagRewriter = new TagRewriter<>(this);
+    private final ParticleRewriter<ClientboundPacket1_21_2> particleRewriter = new ParticleRewriter<>(this, /*Types1_OLD.PARTICLE,*/ Types1_21_4.PARTICLE);
+    private final TagRewriter<ClientboundPacket1_21_2> tagRewriter = new TagRewriter<>(this);
+    private final ComponentRewriter<ClientboundPacket1_21_2> componentRewriter = new ComponentRewriter1_99(this);
 
     public Protocol1_99To_98() {
         // Passing the class types into the super constructor is needed for automatic packet type id remapping, but can otherwise be omitted
-        super(ClientboundPacket1_21.class, ClientboundPacket1_21.class, ServerboundPacket1_20_5.class, ServerboundPacket1_20_5.class);
+        super(ClientboundPacket1_21_2.class, ClientboundPacket1_21_2.class, ServerboundPacket1_21_4.class, ServerboundPacket1_21_4.class);
     }
 
     @Override
     protected void registerPackets() {
         super.registerPackets();
 
-        tagRewriter.registerGeneric(ClientboundPackets1_21.UPDATE_TAGS);
+        tagRewriter.registerGeneric(ClientboundPackets1_21_2.UPDATE_TAGS);
         tagRewriter.registerGeneric(ClientboundConfigurationPackets1_21.UPDATE_TAGS);
 
-        final SoundRewriter<ClientboundPacket1_21> soundRewriter = new SoundRewriter<>(this);
-        soundRewriter.registerSound1_19_3(ClientboundPackets1_21.SOUND);
-        soundRewriter.registerSound1_19_3(ClientboundPackets1_21.SOUND_ENTITY);
+        // If needed for item or component changes
+        componentRewriter.registerOpenScreen(ClientboundPackets1_21_2.OPEN_SCREEN);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SET_ACTION_BAR_TEXT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SET_TITLE_TEXT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SET_SUBTITLE_TEXT);
+        componentRewriter.registerBossEvent(ClientboundPackets1_21_2.BOSS_EVENT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.DISCONNECT);
+        componentRewriter.registerTabList(ClientboundPackets1_21_2.TAB_LIST);
+        componentRewriter.registerPlayerCombatKill1_20(ClientboundPackets1_21_2.PLAYER_COMBAT_KILL);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.SYSTEM_CHAT);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_21_2.DISGUISED_CHAT);
+        componentRewriter.registerPlayerInfoUpdate1_21_4(ClientboundPackets1_21_2.PLAYER_INFO_UPDATE);
+        componentRewriter.registerPing();
 
-        new StatisticsRewriter<>(this).register(ClientboundPackets1_21.AWARD_STATS);
-        new AttributeRewriter<>(this).register1_21(ClientboundPackets1_21.UPDATE_ATTRIBUTES);
+        // If needed for any particle, item, or block changes. Extend ParticleRewriter for particle serializer changes
+        particleRewriter.registerLevelParticles1_20_5(ClientboundPackets1_21_2.LEVEL_PARTICLES);
+        particleRewriter.registerExplode1_21_2(ClientboundPackets1_21_2.EXPLODE); // Rewrites the included sound and particles
+
+        final SoundRewriter<ClientboundPacket1_21_2> soundRewriter = new SoundRewriter<>(this);
+        soundRewriter.registerSound1_19_3(ClientboundPackets1_21_2.SOUND);
+        soundRewriter.registerSound1_19_3(ClientboundPackets1_21_2.SOUND_ENTITY);
+
+        new StatisticsRewriter<>(this).register(ClientboundPackets1_21_2.AWARD_STATS);
+        new AttributeRewriter<>(this).register1_21(ClientboundPackets1_21_2.UPDATE_ATTRIBUTES);
 
         // Uncomment if an existing type changed serialization format. Mappings for argument type keys can also be defined in mapping files
         /*new CommandRewriter1_19_4<>(this) {
@@ -81,25 +105,29 @@ final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, Cl
                     super.handleArgument(wrapper, argumentType);
                 }
             }
-        }.registerDeclareCommands1_19(ClientboundPackets1_21.COMMANDS);*/
+        }.registerDeclareCommands1_19(ClientboundPackets1_21_2.COMMANDS);*/
     }
 
     @Override
     protected void onMappingDataLoaded() {
         // Uncomment this if the entity types enum has been newly added specifically for this Protocol
-        // EntityTypes1_20_5.initialize(this);
+        // EntityTypes1_21_4.initialize(this);
 
         // Uncomment if a new particle was added = ids shifted; requires a new Types_ class copied from the last
-        /*Types1_21.PARTICLE.filler(this)
-                .reader("block", ParticleType.Readers.BLOCK)
-                .reader("block_marker", ParticleType.Readers.BLOCK)
-                .reader("dust", ParticleType.Readers.DUST)
-                .reader("falling_dust", ParticleType.Readers.BLOCK)
-                .reader("dust_color_transition", ParticleType.Readers.DUST_TRANSITION)
-                .reader("item", ParticleType.Readers.ITEM1_20_2)
-                .reader("vibration", ParticleType.Readers.VIBRATION1_20_3)
-                .reader("sculk_charge", ParticleType.Readers.SCULK_CHARGE)
-                .reader("shriek", ParticleType.Readers.SHRIEK);*/
+        /*Types1_21_4.PARTICLE.filler(this)
+            .reader("block", ParticleType.Readers.BLOCK)
+            .reader("block_marker", ParticleType.Readers.BLOCK)
+            .reader("dust_pillar", ParticleType.Readers.BLOCK)
+            .reader("falling_dust", ParticleType.Readers.BLOCK)
+            .reader("block_crumble", ParticleType.Readers.BLOCK)
+            .reader("dust", ParticleType.Readers.DUST1_21_2)
+            .reader("dust_color_transition", ParticleType.Readers.DUST_TRANSITION1_21_2)
+            .reader("vibration", ParticleType.Readers.VIBRATION1_20_3)
+            .reader("sculk_charge", ParticleType.Readers.SCULK_CHARGE)
+            .reader("shriek", ParticleType.Readers.SHRIEK)
+            .reader("entity_effect", ParticleType.Readers.COLOR)
+            .reader("trail", ParticleType.Readers.TRAIL1_21_4)
+            .reader("item", ParticleType.Readers.item(itemRewriter.mappedItemType()));*/
 
         super.onMappingDataLoaded(); // Calls load methods on rewriters. Last in case the rewriters access the above filled data
     }
@@ -107,7 +135,7 @@ final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, Cl
     @Override
     public void init(final UserConnection connection) {
         // Register the entity tracker - used for entity id/entity data rewriting AND for tracking world data sent to the client (then used for chunk data rewriting)
-        addEntityTracker(connection, new EntityTrackerBase(connection, EntityTypes1_20_5.PLAYER));
+        addEntityTracker(connection, new EntityTrackerBase(connection, EntityTypes1_21_4.PLAYER));
     }
 
     // Overriding these four methods is important as they are relied on various rewriter classes
@@ -128,17 +156,27 @@ final class Protocol1_99To_98 extends AbstractProtocol<ClientboundPacket1_21, Cl
     }
 
     @Override
-    public TagRewriter<ClientboundPacket1_21> getTagRewriter() {
+    public ParticleRewriter<ClientboundPacket1_21_2> getParticleRewriter() {
+        return particleRewriter;
+    }
+
+    @Override
+    public TagRewriter<ClientboundPacket1_21_2> getTagRewriter() {
         return tagRewriter;
     }
 
     @Override
-    protected PacketTypesProvider<ClientboundPacket1_21, ClientboundPacket1_21, ServerboundPacket1_20_5, ServerboundPacket1_20_5> createPacketTypesProvider() {
+    public ComponentRewriter<ClientboundPacket1_21_2> getComponentRewriter() {
+        return componentRewriter;
+    }
+
+    @Override
+    protected PacketTypesProvider<ClientboundPacket1_21_2, ClientboundPacket1_21_2, ServerboundPacket1_21_4, ServerboundPacket1_21_4> createPacketTypesProvider() {
         return new SimplePacketTypesProvider<>(
-            packetTypeMap(unmappedClientboundPacketType, ClientboundPackets1_21.class, ClientboundConfigurationPackets1_21.class),
-            packetTypeMap(mappedClientboundPacketType, ClientboundPackets1_21.class, ClientboundConfigurationPackets1_21.class),
-            packetTypeMap(mappedServerboundPacketType, ServerboundPackets1_20_5.class, ServerboundConfigurationPackets1_20_5.class),
-            packetTypeMap(unmappedServerboundPacketType, ServerboundPackets1_20_5.class, ServerboundConfigurationPackets1_20_5.class)
+            packetTypeMap(unmappedClientboundPacketType, ClientboundPackets1_21_2.class, ClientboundConfigurationPackets1_21.class),
+            packetTypeMap(mappedClientboundPacketType, ClientboundPackets1_21_2.class, ClientboundConfigurationPackets1_21.class),
+            packetTypeMap(mappedServerboundPacketType, ServerboundPackets1_21_4.class, ServerboundConfigurationPackets1_20_5.class),
+            packetTypeMap(unmappedServerboundPacketType, ServerboundPackets1_21_4.class, ServerboundConfigurationPackets1_20_5.class)
         );
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_10to1_11/Protocol1_10To1_11.java

@@ -132,13 +132,13 @@ public class Protocol1_10To1_11 extends AbstractProtocol<ClientboundPackets1_9_3
                     if (effectID == 2002) {
                         int data = packetWrapper.get(Types.INT, 1);
                         boolean isInstant = false;
-                        Pair<Integer, Boolean> newData = PotionColorMappings1_11.getNewData(data);
+                        PotionColorMappings1_11.PotionData newData = PotionColorMappings1_11.getNewData(data);
                         if (newData == null) {
                             getLogger().warning("Received unknown potion data: " + data);
                             data = 0;
                         } else {
-                            data = newData.key();
-                            isInstant = newData.value();
+                            data = newData.data();
+                            isInstant = newData.instant();
                         }
                         if (isInstant) {
                             packetWrapper.set(Types.INT, 0, 2007);

common/src/main/java/com/viaversion/viaversion/protocols/v1_10to1_11/data/PotionColorMappings1_11.java

@@ -17,14 +17,13 @@
  */
 package com.viaversion.viaversion.protocols.v1_10to1_11.data;
 
-import com.viaversion.viaversion.util.Pair;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class PotionColorMappings1_11 {
 
-    //<oldData> to <newData, isInstant> mapping
-    private static final Int2ObjectMap<Pair<Integer, Boolean>> POTIONS = new Int2ObjectOpenHashMap<>(37);
+    private static final Int2ObjectMap<PotionData> POTIONS = new Int2ObjectOpenHashMap<>(37);
 
     static {
         addRewrite(0, 3694022, false);
@@ -66,12 +65,14 @@ public class PotionColorMappings1_11 {
         addRewrite(36, 3381504, false);
     }
 
-    public static Pair<Integer, Boolean> getNewData(int oldData) {
+    public static @Nullable PotionData getNewData(int oldData) {
         return POTIONS.get(oldData);
     }
 
     private static void addRewrite(int oldData, int newData, boolean isInstant) {
-        POTIONS.put(oldData, new Pair<>(newData, isInstant));
+        POTIONS.put(oldData, new PotionData(newData, isInstant));
     }
 
+    public record PotionData(int data, boolean instant) {
+    }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_10to1_11/rewriter/EntityPacketRewriter1_11.java

@@ -24,9 +24,9 @@ import com.viaversion.viaversion.api.minecraft.ClientWorld;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_10;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
 import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11.EntityType;
-import com.viaversion.viaversion.api.minecraft.item.DataItem;
 import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
 import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_9;
+import com.viaversion.viaversion.api.minecraft.item.DataItem;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.type.Types;
@@ -37,6 +37,7 @@ import com.viaversion.viaversion.protocols.v1_10to1_11.data.EntityMappings1_11;
 import com.viaversion.viaversion.protocols.v1_10to1_11.storage.EntityTracker1_11;
 import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
 import com.viaversion.viaversion.rewriter.EntityRewriter;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.logging.Level;
@@ -91,13 +92,27 @@ public class EntityPacketRewriter1_11 extends EntityRewriter<ClientboundPackets1
                 map(Types.INT); // 8 - Data
 
                 // Track Entity
+                handler(objectTrackerHandler());
                 handler(wrapper -> {
                     byte type = wrapper.get(Types.BYTE, 0);
                     if (type == EntityTypes1_10.ObjectType.FISHIHNG_HOOK.getId()) {
                         tryFixFishingHookVelocity(wrapper);
+                    } else if (type == EntityTypes1_10.ObjectType.ITEM.getId()) {
+                        // Older clients used stone as fallback as long as the entity data was not set
+                        wrapper.send(Protocol1_10To1_11.class);
+                        wrapper.cancel();
+
+                        final int entityId = wrapper.get(Types.VAR_INT, 0);
+
+                        final List<EntityData> entityDataList = new ArrayList<>();
+                        entityDataList.add(new EntityData(6, EntityDataTypes1_9.ITEM, new DataItem(1, (byte) 1, null)));
+
+                        final PacketWrapper setItem = PacketWrapper.create(ClientboundPackets1_9_3.SET_ENTITY_DATA, wrapper.user());
+                        setItem.write(Types.VAR_INT, entityId);
+                        setItem.write(Types1_9.ENTITY_DATA_LIST, entityDataList);
+                        setItem.send(Protocol1_10To1_11.class);
                     }
                 });
-                handler(objectTrackerHandler());
             }
         });
 

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/Protocol1_12_2To1_13.java

@@ -34,6 +34,7 @@ import com.viaversion.viaversion.api.protocol.packet.State;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
 import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
 import com.viaversion.viaversion.api.protocol.remapper.ValueTransformer;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import com.viaversion.viaversion.api.type.Types;
 import com.viaversion.viaversion.api.type.types.misc.ParticleType;
 import com.viaversion.viaversion.api.type.types.version.Types1_13;
@@ -145,7 +146,7 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
             }).scheduleSend(Protocol1_12_2To1_13.class);
 
             // Send tags packet
-            w.create(ClientboundPackets1_13.UPDATE_TAGS, wrapper -> {
+            final PacketWrapper tagsPacket = w.create(ClientboundPackets1_13.UPDATE_TAGS, wrapper -> {
                 wrapper.write(Types.VAR_INT, MAPPINGS.getBlockTags().size()); // block tags
                 for (Map.Entry<String, int[]> tag : MAPPINGS.getBlockTags().entrySet()) {
                     wrapper.write(Types.STRING, tag.getKey());
@@ -164,7 +165,13 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     // Needs copy as other protocols may modify it
                     wrapper.write(Types.VAR_INT_ARRAY_PRIMITIVE, tag.getValue().clone());
                 }
-            }).scheduleSend(Protocol1_12_2To1_13.class);
+            });
+            if (w.user().getProtocolInfo().protocolVersion().newerThanOrEqualTo(ProtocolVersion.v1_20_5)) {
+                // Make sure it's included in the configuration packets as it may already be required for registry data
+                tagsPacket.send(Protocol1_12_2To1_13.class);
+            } else {
+                tagsPacket.scheduleSend(Protocol1_12_2To1_13.class);
+            }
         };
 
     @Override
@@ -346,7 +353,7 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
         registerClientbound(ClientboundPackets1_12_1.PLACE_GHOST_RECIPE, new PacketHandlers() {
             @Override
             public void register() {
-                map(Types.BYTE);
+                map(Types.UNSIGNED_BYTE);
                 handler(wrapper -> wrapper.write(Types.STRING, "viaversion:legacy/" + wrapper.read(Types.VAR_INT)));
             }
         });
@@ -587,7 +594,7 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
         registerServerbound(ServerboundPackets1_13.PLACE_RECIPE, new PacketHandlers() {
             @Override
             public void register() {
-                map(Types.BYTE); // Window id
+                map(Types.UNSIGNED_BYTE); // Window id
 
                 handler(wrapper -> {
                     String s = wrapper.read(Types.STRING);
@@ -768,7 +775,10 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     for (Item[] ingredient : recipe.ingredients()) {
                         Item[] clone = new Item[ingredient.length];
                         for (int i = 0; i < ingredient.length; i++) {
-                            if (clone[i] == null) continue;
+                            if (ingredient[i] == null) {
+                                continue;
+                            }
+
                             clone[i] = ingredient[i].copy();
                         }
                         recipesPacket.write(Types.ITEM1_13_ARRAY, clone);
@@ -782,7 +792,10 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     for (Item[] ingredient : recipe.ingredients()) {
                         Item[] clone = new Item[ingredient.length];
                         for (int i = 0; i < ingredient.length; i++) {
-                            if (clone[i] == null) continue;
+                            if (ingredient[i] == null) {
+                                continue;
+                            }
+
                             clone[i] = ingredient[i].copy();
                         }
                         recipesPacket.write(Types.ITEM1_13_ARRAY, clone);
@@ -793,7 +806,10 @@ public class Protocol1_12_2To1_13 extends AbstractProtocol<ClientboundPackets1_1
                     recipesPacket.write(Types.STRING, recipe.group());
                     Item[] ingredient = new Item[recipe.ingredient().length];
                     for (int i = 0; i < ingredient.length; i++) {
-                        if (recipe.ingredient()[i] == null) continue;
+                        if (recipe.ingredient()[i] == null) {
+                            continue;
+                        }
+
                         ingredient[i] = recipe.ingredient()[i].copy();
                     }
                     recipesPacket.write(Types.ITEM1_13_ARRAY, ingredient);

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/provider/BlockEntityProvider.java

@@ -33,6 +33,7 @@ import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.FlowerPotHandler;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.SkullHandler;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities.SpawnerHandler;
+import com.viaversion.viaversion.util.ComponentUtil;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -46,6 +47,21 @@ public class BlockEntityProvider implements Provider {
         handlers.put("minecraft:skull", new SkullHandler());
         handlers.put("minecraft:mob_spawner", new SpawnerHandler());
         handlers.put("minecraft:command_block", new CommandBlockHandler());
+
+        final BlockEntityHandler customNameHandler = (user, tag) -> {
+            final StringTag name = tag.getStringTag("CustomName");
+            if (name != null) {
+                name.setValue(ComponentUtil.legacyToJsonString(name.getValue()));
+            }
+            return -1;
+        };
+        handlers.put("minecraft:chest", customNameHandler);
+        handlers.put("minecraft:dispenser", customNameHandler);
+        handlers.put("minecraft:dropper", customNameHandler);
+        handlers.put("minecraft:enchanting_table", customNameHandler);
+        handlers.put("minecraft:furnace", customNameHandler);
+        handlers.put("minecraft:hopper", customNameHandler);
+        handlers.put("minecraft:shulker_box", customNameHandler);
     }
 
     /**

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/provider/blockentities/FlowerPotHandler.java

@@ -18,16 +18,19 @@
 package com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.blockentities;
 
 import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.protocols.v1_12_2to1_13.provider.BlockEntityProvider;
 import com.viaversion.viaversion.util.Key;
-import com.viaversion.viaversion.util.Pair;
+import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 
 public class FlowerPotHandler implements BlockEntityProvider.BlockEntityHandler {
-    // Object -> string (id without namespace) or byte (numeric id)
-    private static final Map<Pair<?, Byte>, Integer> flowers = new ConcurrentHashMap<>();
+    private static final int EMPTY_POT = 5265;
+    private static final Map<String, Byte> STRING_TO_BYTE_ID = new HashMap<>();
+    private static final Map<IntIdPair, Integer> FLOWERS = new HashMap<>();
 
     static {
         register("air", (byte) 0, (byte) 0, 5265);
@@ -55,37 +58,40 @@ public class FlowerPotHandler implements BlockEntityProvider.BlockEntityHandler
 
     }
 
-    public static void register(String identifier, byte numbericBlockId, byte blockData, int newId) {
-        flowers.put(new Pair<>(identifier, blockData), newId);
-        flowers.put(new Pair<>(numbericBlockId, blockData), newId);
+    private static void register(String identifier, byte blockId, byte blockData, int newId) {
+        STRING_TO_BYTE_ID.put(identifier, blockId);
+        FLOWERS.put(new IntIdPair(blockId, blockData), newId);
     }
 
     @Override
     public int transform(UserConnection user, CompoundTag tag) {
-        Object item = tag.contains("Item") ? tag.get("Item").getValue() : null;
-        Object data = tag.contains("Data") ? tag.get("Data").getValue() : null;
-
         // Convert item to String without namespace or to Byte
-        if (item instanceof String) {
-            item = Key.stripMinecraftNamespace((String) item);
-        } else if (item instanceof Number) {
-            item = ((Number) item).byteValue();
-        } else {
-            item = (byte) 0;
+        Tag itemTag = tag.get("Item");
+        byte item = 0;
+        if (itemTag instanceof StringTag stringTag) {
+            item = STRING_TO_BYTE_ID.getOrDefault(Key.stripMinecraftNamespace(stringTag.getValue()), (byte) 0);
+        } else if (itemTag instanceof NumberTag numberTag) {
+            item = numberTag.asByte();
         }
 
-        // Convert data to Byte
-        if (data instanceof Number) {
-            data = ((Number) data).byteValue();
-        } else {
-            data = (byte) 0;
+        byte data = 0;
+        if (tag.get("Data") instanceof NumberTag dataTag) {
+            data = dataTag.asByte();
         }
 
-        Integer flower = flowers.get(new Pair<>(item, (byte) data));
-        if (flower != null) return flower;
-        flower = flowers.get(new Pair<>(item, (byte) 0));
-        if (flower != null) return flower;
+        Integer flower = FLOWERS.get(new IntIdPair(item, data));
+        if (flower != null) {
+            return flower;
+        }
 
-        return 5265; // Fallback to empty pot
+        flower = FLOWERS.get(new IntIdPair(item, (byte) 0));
+        if (flower != null) {
+            return flower;
+        }
+
+        return EMPTY_POT; // Fallback to empty pot
+    }
+
+    private record IntIdPair(int id, byte data) {
     }
 }

common/src/main/java/com/viaversion/viaversion/protocols/v1_12_2to1_13/rewriter/ItemPacketRewriter1_13.java

@@ -205,23 +205,23 @@ public class ItemPacketRewriter1_13 extends ItemRewriter<ClientboundPackets1_12_
                     String old = channel;
                     channel = getOldPluginChannelId(channel);
                     if (channel == null) {
-                        if (!Via.getConfig().isSuppressConversionWarnings()) {
+                        if (Via.getManager().isDebug()) {
                             protocol.getLogger().warning("Ignoring serverbound plugin message with channel: " + old);
                         }
                         wrapper.cancel();
                         return;
                     } else if (channel.equals("REGISTER") || channel.equals("UNREGISTER")) {
-                        String[] channels = new String(wrapper.read(Types.REMAINING_BYTES), StandardCharsets.UTF_8).split("\0");
+                        String[] channels = new String(wrapper.read(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA), StandardCharsets.UTF_8).split("\0");
                         List<String> rewrittenChannels = new ArrayList<>();
                         for (String s : channels) {
                             String rewritten = getOldPluginChannelId(s);
                             if (rewritten != null) {
                                 rewrittenChannels.add(rewritten);
-                            } else if (!Via.getConfig().isSuppressConversionWarnings()) {
+                            } else if (Via.getManager().isDebug()) {
                                 protocol.getLogger().warning("Ignoring plugin channel in serverbound " + channel + ": " + s);
                             }
                         }
-                        wrapper.write(Types.REMAINING_BYTES, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
+                        wrapper.write(Types.SERVERBOUND_CUSTOM_PAYLOAD_DATA, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
                     }
                     wrapper.set(Types.STRING, 0, channel);
                 });