diff --git a/api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSet.java b/api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSet.java
index 59f09922a..b9796f734 100644
--- a/api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSet.java
+++ b/api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSet.java
@@ -24,6 +24,9 @@ package com.viaversion.viaversion.api.minecraft;
 
 import com.viaversion.viaversion.util.EitherImpl;
 
+/**
+ * Set of ids that either holds a string tag key or an array of ids.
+ */
 public final class HolderSet extends EitherImpl<String, int[]> {
 
     public HolderSet(final String tagKey) {
diff --git a/api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataKey.java b/api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataKey.java
index ea34f2cd9..e3b98bfdb 100644
--- a/api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataKey.java
+++ b/api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataKey.java
@@ -65,7 +65,7 @@ public final class StructuredDataKey<T> {
     public static final StructuredDataKey<Unit> CREATIVE_SLOT_LOCK = new StructuredDataKey<>("creative_slot_lock", Type.EMPTY);
     public static final StructuredDataKey<Boolean> ENCHANTMENT_GLINT_OVERRIDE = new StructuredDataKey<>("enchantment_glint_override", Type.BOOLEAN);
     public static final StructuredDataKey<Unit> INTANGIBLE_PROJECTILE = new StructuredDataKey<>("intangible_projectile", Type.EMPTY);
-    public static final StructuredDataKey<Enchantments> STORED_ENCHANTMENTS = new StructuredDataKey<>("storded_enchantments", Enchantments.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", Type.INT);
     public static final StructuredDataKey<Integer> MAP_ID = new StructuredDataKey<>("map_id", Type.VAR_INT);
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/MappingData.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/MappingData.java
index 818ff8ba4..ad52a4a80 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/MappingData.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/data/MappingData.java
@@ -18,19 +18,16 @@
 package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data;
 
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
-import com.github.steveice10.opennbt.tag.builtin.ListTag;
 import com.github.steveice10.opennbt.tag.builtin.StringTag;
 import com.viaversion.viaversion.api.data.MappingDataBase;
 import com.viaversion.viaversion.api.data.MappingDataLoader;
-import it.unimi.dsi.fastutil.objects.Object2IntMap;
-import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
-import java.util.ArrayList;
-import java.util.List;
+import com.viaversion.viaversion.util.KeyMappings;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class MappingData extends MappingDataBase {
 
-    private final Object2IntMap<String> byId = new Object2IntOpenHashMap<>();
-    private final List<String> itemIds = new ArrayList<>();
+    private KeyMappings items;
+    private KeyMappings blocks;
 
     public MappingData() {
         super("1.20.3", "1.20.5");
@@ -40,20 +37,24 @@ public class MappingData extends MappingDataBase {
     protected void loadExtras(final CompoundTag data) {
         super.loadExtras(data);
 
-        final ListTag<StringTag> items = MappingDataLoader.loadNBT("itemIds-1.20.3.nbt").getListTag("items", StringTag.class);
-        for (int i = 0; i < items.size(); i++) {
-            final StringTag tag = items.get(i);
-            itemIds.add(tag.getValue());
-            byId.put(tag.getValue(), i);
-        }
-        byId.defaultReturnValue(-1);
+        final CompoundTag extraMappings = MappingDataLoader.loadNBT("items-blocks-1.20.3.nbt");
+        items = new KeyMappings(extraMappings.getListTag("items", StringTag.class));
+        blocks = new KeyMappings(extraMappings.getListTag("blocks", StringTag.class));
     }
 
     public int itemId(final String name) {
-        return byId.getInt(name);
+        return items.keyToId(name);
     }
 
-    public String itemName(final int id) {
-        return itemIds.get(id);
+    public @Nullable String itemName(final int id) {
+        return items.idToKey(id);
+    }
+
+    public int blockId(final String name) {
+        return blocks.keyToId(name);
+    }
+
+    public @Nullable String blockName(final int id) {
+        return blocks.idToKey(id);
     }
 }
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java
index 6d9c8af1e..f9d2cd4e2 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/BlockItemPacketRewriter1_20_5.java
@@ -17,16 +17,19 @@
  */
 package com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.rewriter;
 
+import com.github.steveice10.opennbt.stringified.SNBT;
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
 import com.github.steveice10.opennbt.tag.builtin.IntArrayTag;
 import com.github.steveice10.opennbt.tag.builtin.ListTag;
 import com.github.steveice10.opennbt.tag.builtin.NumberTag;
 import com.github.steveice10.opennbt.tag.builtin.StringTag;
 import com.github.steveice10.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.data.ParticleMappings;
 import com.viaversion.viaversion.api.minecraft.GameProfile;
 import com.viaversion.viaversion.api.minecraft.GlobalPosition;
 import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.HolderSet;
 import com.viaversion.viaversion.api.minecraft.Particle;
 import com.viaversion.viaversion.api.minecraft.data.StructuredData;
 import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
@@ -34,6 +37,7 @@ import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
 import com.viaversion.viaversion.api.minecraft.item.DataItem;
 import com.viaversion.viaversion.api.minecraft.item.Item;
 import com.viaversion.viaversion.api.minecraft.item.StructuredItem;
+import com.viaversion.viaversion.api.minecraft.item.data.AdventureModePredicate;
 import com.viaversion.viaversion.api.minecraft.item.data.ArmorTrim;
 import com.viaversion.viaversion.api.minecraft.item.data.ArmorTrimMaterial;
 import com.viaversion.viaversion.api.minecraft.item.data.ArmorTrimPattern;
@@ -41,6 +45,7 @@ import com.viaversion.viaversion.api.minecraft.item.data.AttributeModifier;
 import com.viaversion.viaversion.api.minecraft.item.data.AttributeModifiers;
 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.BlockPredicate;
 import com.viaversion.viaversion.api.minecraft.item.data.BlockStateProperties;
 import com.viaversion.viaversion.api.minecraft.item.data.DyedColor;
 import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
@@ -53,6 +58,7 @@ import com.viaversion.viaversion.api.minecraft.item.data.ModifierData;
 import com.viaversion.viaversion.api.minecraft.item.data.PotionContents;
 import com.viaversion.viaversion.api.minecraft.item.data.PotionEffect;
 import com.viaversion.viaversion.api.minecraft.item.data.PotionEffectData;
+import com.viaversion.viaversion.api.minecraft.item.data.StatePropertyMatcher;
 import com.viaversion.viaversion.api.minecraft.item.data.SuspiciousStewEffect;
 import com.viaversion.viaversion.api.minecraft.item.data.Unbreakable;
 import com.viaversion.viaversion.api.minecraft.item.data.WrittenBook;
@@ -79,6 +85,7 @@ import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.packet.Serverb
 import com.viaversion.viaversion.rewriter.BlockRewriter;
 import com.viaversion.viaversion.rewriter.ItemRewriter;
 import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.Either;
 import com.viaversion.viaversion.util.Key;
 import com.viaversion.viaversion.util.UUIDUtil;
 import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
@@ -88,12 +95,14 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.UUID;
+import java.util.logging.Level;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<ClientboundPacket1_20_3, ServerboundPacket1_20_5, Protocol1_20_5To1_20_3> {
 
     public static final String[] MOB_TAGS = {"NoAI", "Silent", "NoGravity", "Glowing", "Invulnerable", "Health", "Age", "Variant", "HuntingCooldown", "BucketVariantTag"};
     private static final GameProfile.Property[] EMPTY_PROPERTIES = new GameProfile.Property[0];
+    private static final StatePropertyMatcher[] EMPTY_PROPERTY_MATCHERS = new StatePropertyMatcher[0];
 
     public BlockItemPacketRewriter1_20_5(final Protocol1_20_5To1_20_3 protocol) {
         super(protocol, Type.ITEM1_20_2, Type.ITEM1_20_2_ARRAY, Types1_20_5.ITEM, Types1_20_5.ITEM_ARRAY);
@@ -392,8 +401,6 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             updateMapDecorations(data, decorationsTag);
         }
 
-        // MAP_POST_PROCESSING is only used internally
-
         updateProfile(data, tag.get("SkullOwner"));
 
         final CompoundTag customCreativeLock = tag.getCompoundTag("CustomCreativeLock");
@@ -401,15 +408,82 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
             data.set(StructuredDataKey.CREATIVE_SLOT_LOCK);
         }
 
-        // TODO
-        //  StructuredDataKey.CAN_PLACE_ON
-        //  StructuredDataKey.CAN_BREAK
-        //  (remaining ones should only affect non-essential item tooltip, or not be shown/checked at all)
+        final ListTag<StringTag> canPlaceOnTag = tag.getListTag("CanPlaceOn", StringTag.class);
+        if (canPlaceOnTag != null) {
+            data.set(StructuredDataKey.CAN_PLACE_ON, updateBlockPredicates(canPlaceOnTag, (hideFlagsValue & StructuredDataConverter.HIDE_CAN_PLACE_ON) == 0));
+        }
+
+        final ListTag<StringTag> canDestroyTag = tag.getListTag("CanDestroy", StringTag.class);
+        if (canDestroyTag != null) {
+            data.set(StructuredDataKey.CAN_BREAK, updateBlockPredicates(canDestroyTag, (hideFlagsValue & StructuredDataConverter.HIDE_CAN_DESTROY) == 0));
+        }
+
+        // TODO MAP_POST_PROCESSING
 
         data.set(StructuredDataKey.CUSTOM_DATA, tag);
         return item;
     }
 
+    private AdventureModePredicate updateBlockPredicates(final ListTag<StringTag> tag, final boolean showInTooltip) {
+        final BlockPredicate[] predicates = tag.stream()
+            .map(StringTag::getValue)
+            .map(this::deserializeBlockPredicate)
+            .filter(Objects::nonNull)
+            .toArray(BlockPredicate[]::new);
+        return new AdventureModePredicate(predicates, showInTooltip);
+    }
+
+    private @Nullable BlockPredicate deserializeBlockPredicate(final String rawPredicate) {
+        final int propertiesStartIndex = rawPredicate.indexOf('[');
+        final int tagStartIndex = rawPredicate.indexOf('{');
+        int idLength = rawPredicate.length();
+        if (propertiesStartIndex != -1) {
+            idLength = propertiesStartIndex;
+        }
+        if (tagStartIndex != -1) {
+            idLength = Math.min(propertiesStartIndex, tagStartIndex);
+        }
+
+        final String identifier = rawPredicate.substring(0, idLength);
+        final int id = Protocol1_20_5To1_20_3.MAPPINGS.blockId(identifier);
+        if (id == -1) {
+            return null;
+        }
+
+        final int propertiesEndIndex = rawPredicate.indexOf(']');
+        final List<StatePropertyMatcher> propertyMatchers = new ArrayList<>();
+        if (propertiesStartIndex != -1 && propertiesEndIndex != -1) {
+            for (final String property : rawPredicate.substring(propertiesStartIndex + 1, propertiesEndIndex).split(",")) {
+                final int propertySplitIndex = property.indexOf('=');
+                if (propertySplitIndex == -1) {
+                    continue;
+                }
+
+                final String propertyId = property.substring(0, propertySplitIndex).trim();
+                final String propertyValue = property.substring(propertySplitIndex + 1).trim();
+                propertyMatchers.add(new StatePropertyMatcher(propertyId, Either.left(propertyValue))); // TODO Also handle ranged matchers
+            }
+        }
+
+        final int tagEndIndex = rawPredicate.indexOf('}');
+        CompoundTag tag = null;
+        if (tagStartIndex != -1 && tagEndIndex != -1) {
+            try {
+                tag = SNBT.deserializeCompoundTag(rawPredicate.substring(tagStartIndex, tagEndIndex + 1));
+            } catch (final Exception e) {
+                if (Via.getManager().isDebug()) {
+                    Via.getPlatform().getLogger().log(Level.SEVERE, "Failed to parse block predicate tag: " + rawPredicate.substring(tagStartIndex, tagEndIndex + 1), e);
+                }
+            }
+        }
+
+        return new BlockPredicate(
+            new HolderSet(new int[]{Protocol1_20_5To1_20_3.MAPPINGS.getNewBlockId(id)}),
+            propertyMatchers.isEmpty() ? null : propertyMatchers.toArray(EMPTY_PROPERTY_MATCHERS),
+            tag
+        );
+    }
+
     private void updateAttributes(final StructuredDataContainer data, final ListTag<CompoundTag> attributeModifiersTag, final boolean showInTooltip) {
         final AttributeModifier[] modifiers = attributeModifiersTag.stream().map(modifierTag -> {
             final String attributeName = modifierTag.getString("AttributeName");
@@ -676,7 +750,7 @@ public final class BlockItemPacketRewriter1_20_5 extends ItemRewriter<Clientboun
     }
 
     private int toItemId(final String id) {
-        final int unmappedId = protocol.getMappingData().itemId(Key.stripMinecraftNamespace(id));
+        final int unmappedId = protocol.getMappingData().itemId(id);
         return unmappedId != -1 ? protocol.getMappingData().getNewItemId(unmappedId) : -1;
     }
 
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java
index 2a31be9cf..ad8abfca6 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java
@@ -38,7 +38,6 @@ import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.Enchantme
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.Instruments1_20_3;
 import com.viaversion.viaversion.protocols.protocol1_20_5to1_20_3.data.MapDecorations1_20_3;
 import com.viaversion.viaversion.util.ComponentUtil;
-import com.viaversion.viaversion.util.Key;
 import com.viaversion.viaversion.util.UUIDUtil;
 import it.unimi.dsi.fastutil.ints.Int2IntMap;
 import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap;
@@ -49,7 +48,7 @@ final class StructuredDataConverter {
     static final int HIDE_ENCHANTMENTS = 1;
     static final int HIDE_ATTRIBUTES = 1 << 1;
     static final int HIDE_UNBREAKABLE = 1 << 2;
-    static final int HIDE_CAN_BREAK = 1 << 3;
+    static final int HIDE_CAN_DESTROY = 1 << 3;
     static final int HIDE_CAN_PLACE_ON = 1 << 4;
     static final int HIDE_ADDITIONAL = 1 << 5;
     static final int HIDE_DYE_COLOR = 1 << 6;
diff --git a/common/src/main/java/com/viaversion/viaversion/util/KeyMappings.java b/common/src/main/java/com/viaversion/viaversion/util/KeyMappings.java
index 2ee36206a..ea8da059f 100644
--- a/common/src/main/java/com/viaversion/viaversion/util/KeyMappings.java
+++ b/common/src/main/java/com/viaversion/viaversion/util/KeyMappings.java
@@ -17,8 +17,11 @@
  */
 package com.viaversion.viaversion.util;
 
+import com.github.steveice10.opennbt.tag.builtin.ListTag;
+import com.github.steveice10.opennbt.tag.builtin.StringTag;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
+import java.util.Collection;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class KeyMappings {
@@ -35,6 +38,14 @@ public final class KeyMappings {
         }
     }
 
+    public KeyMappings(final Collection<String> keys) {
+        this(keys.toArray(new String[0]));
+    }
+
+    public KeyMappings(final ListTag<StringTag> keys) {
+        this(keys.getValue().stream().map(StringTag::getValue).toArray(String[]::new));
+    }
+
     public @Nullable String idToKey(final int id) {
         if (id < 0 || id >= keys.length) {
             return null;
diff --git a/common/src/main/resources/assets/viaversion/data/items-blocks-1.20.3.nbt b/common/src/main/resources/assets/viaversion/data/items-blocks-1.20.3.nbt
new file mode 100644
index 000000000..4d60cfd51
Binary files /dev/null and b/common/src/main/resources/assets/viaversion/data/items-blocks-1.20.3.nbt differ