Port of #325 for Velocity 1.1.0

Co-authored-by: Five (Xer) <admin@xernium.com>

api/src/main/java/com/velocitypowered/api/network/ProtocolVersion.java

@@ -38,7 +38,8 @@ public enum ProtocolVersion {
   MINECRAFT_1_15_1(575, "1.15.1"),
   MINECRAFT_1_15_2(578, "1.15.2"),
   MINECRAFT_1_16(735, "1.16"),
-  MINECRAFT_1_16_1(736, "1.16.1");
+  MINECRAFT_1_16_1(736, "1.16.1"),
+  MINECRAFT_1_16_2(746, "1.16.2");
 
   private final int protocol;
   private final String name;

proxy/src/main/java/com/velocitypowered/proxy/connection/registry/DimensionData.java

@@ -1,11 +1,13 @@
 package com.velocitypowered.proxy.connection.registry;
 
 import com.google.common.base.Preconditions;
+import com.velocitypowered.api.network.ProtocolVersion;
 import net.kyori.nbt.CompoundTag;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class DimensionData {
   private final String registryIdentifier;
+  private final @Nullable Integer dimensionId;
   private final boolean isNatural;
   private final float ambientLight;
   private final boolean isShrunk;
@@ -20,10 +22,12 @@ public final class DimensionData {
   private final String burningBehaviourIdentifier;
   private final @Nullable Long fixedTime;
   private final @Nullable Boolean createDragonFight;
+  private final @Nullable Double coordinateScale;
 
   /**
    * Initializes a new {@link DimensionData} instance.
    * @param registryIdentifier the identifier for the dimension from the registry.
+   * @param dimensionId the dimension ID contained in the registry (the "id" tag)
    * @param isNatural indicates if the dimension use natural world generation (e.g. overworld)
    * @param ambientLight the light level the client sees without external lighting
    * @param isShrunk indicates if the world is shrunk, aka not the full 256 blocks (e.g. nether)
@@ -38,14 +42,18 @@ public final class DimensionData {
    * @param burningBehaviourIdentifier the identifier for how burning blocks work in the dimension
    * @param fixedTime optional. If set to any game daytime value will deactivate time cycle
    * @param createDragonFight optional. Internal flag used in the end dimension
+   * @param coordinateScale optional, unknown purpose
    */
-  public DimensionData(String registryIdentifier, boolean isNatural,
+  public DimensionData(String registryIdentifier,
+      @Nullable Integer dimensionId,
+      boolean isNatural,
       float ambientLight, boolean isShrunk, boolean isUltrawarm,
       boolean hasCeiling, boolean hasSkylight,
       boolean isPiglinSafe, boolean doBedsWork,
       boolean doRespawnAnchorsWork, boolean hasRaids,
       int logicalHeight, String burningBehaviourIdentifier,
-                       @Nullable Long fixedTime, @Nullable Boolean createDragonFight) {
+      @Nullable Long fixedTime, @Nullable Boolean createDragonFight,
+      @Nullable Double coordinateScale) {
     Preconditions.checkNotNull(
         registryIdentifier, "registryIdentifier cannot be null");
     Preconditions.checkArgument(registryIdentifier.length() > 0,
@@ -56,6 +64,7 @@ public final class DimensionData {
     Preconditions.checkArgument(burningBehaviourIdentifier.length() > 0,
         "burningBehaviourIdentifier cannot be empty");
     this.registryIdentifier = registryIdentifier;
+    this.dimensionId = dimensionId;
     this.isNatural = isNatural;
     this.ambientLight = ambientLight;
     this.isShrunk = isShrunk;
@@ -70,12 +79,17 @@ public final class DimensionData {
     this.burningBehaviourIdentifier = burningBehaviourIdentifier;
     this.fixedTime = fixedTime;
     this.createDragonFight = createDragonFight;
+    this.coordinateScale = coordinateScale;
   }
 
   public String getRegistryIdentifier() {
     return registryIdentifier;
   }
 
+  public @Nullable Integer getDimensionId() {
+    return dimensionId;
+  }
+
   public boolean isNatural() {
     return isNatural;
   }
@@ -132,43 +146,77 @@ public final class DimensionData {
     return createDragonFight;
   }
 
+  public @Nullable Double getCoordinateScale() {
+    return coordinateScale;
+  }
+
   /**
    * Parses a given CompoundTag to a DimensionData instance.
-   * @param toRead the compound from the registry to read
+   * @param dimTag the compound from the registry to read
+   * @param version the protocol version from the registry
    * @return game dimension data
    */
-  public static DimensionData decodeCompoundTag(CompoundTag toRead) {
+  public static DimensionData decodeCompoundTag(CompoundTag dimTag, ProtocolVersion version) {
-    Preconditions.checkNotNull(toRead, "CompoundTag cannot be null");
+    Preconditions.checkNotNull(dimTag, "CompoundTag cannot be null");
-    String registryIdentifier = toRead.getString("name");
+    String registryIdentifier = dimTag.getString("name");
-    boolean isNatural = toRead.getBoolean("natural");
+    CompoundTag details;
-    float ambientLight = toRead.getFloat("ambient_light");
+    Integer dimensionId = null;
-    boolean isShrunk = toRead.getBoolean("shrunk");
+    if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
-    boolean isUltrawarm = toRead.getBoolean("ultrawarm");
+      dimensionId = dimTag.getInt("id");
-    boolean hasCeiling = toRead.getBoolean("has_ceiling");
+      details = dimTag.getCompound("element");
-    boolean hasSkylight = toRead.getBoolean("has_skylight");
+    } else {
-    boolean isPiglinSafe = toRead.getBoolean("piglin_safe");
+      details = dimTag;
-    boolean doBedsWork = toRead.getBoolean("bed_works");
+    }
-    boolean doRespawnAnchorsWork = toRead.getBoolean("respawn_anchor_works");
+    boolean isNatural = details.getBoolean("natural");
-    boolean hasRaids = toRead.getBoolean("has_raids");
+    float ambientLight = details.getFloat("ambient_light");
-    int logicalHeight = toRead.getInt("logical_height");
+    boolean isShrunk = details.getBoolean("shrunk");
-    String burningBehaviourIdentifier = toRead.getString("infiniburn");
+    boolean isUltrawarm = details.getBoolean("ultrawarm");
-    Long fixedTime = toRead.contains("fixed_time")
+    boolean hasCeiling = details.getBoolean("has_ceiling");
-            ? toRead.getLong("fixed_time") : null;
+    boolean hasSkylight = details.getBoolean("has_skylight");
-    Boolean hasEnderdragonFight = toRead.contains("has_enderdragon_fight")
+    boolean isPiglinSafe = details.getBoolean("piglin_safe");
-                    ? toRead.getBoolean("has_enderdragon_fight") : null;
+    boolean doBedsWork = details.getBoolean("bed_works");
+    boolean doRespawnAnchorsWork = details.getBoolean("respawn_anchor_works");
+    boolean hasRaids = details.getBoolean("has_raids");
+    int logicalHeight = details.getInt("logical_height");
+    String burningBehaviourIdentifier = details.getString("infiniburn");
+    Long fixedTime = details.contains("fixed_time")
+        ? details.getLong("fixed_time") : null;
+    Boolean hasEnderdragonFight = details.contains("has_enderdragon_fight")
+        ? details.getBoolean("has_enderdragon_fight") : null;
+    Double coordinateScale = details.contains("coordinate_scale")
+        ? details.getDouble("coordinate_scale") : null;
     return new DimensionData(
-            registryIdentifier, isNatural, ambientLight, isShrunk,
+        registryIdentifier, dimensionId, isNatural, ambientLight, isShrunk,
         isUltrawarm, hasCeiling, hasSkylight, isPiglinSafe, doBedsWork, doRespawnAnchorsWork,
-            hasRaids, logicalHeight, burningBehaviourIdentifier, fixedTime, hasEnderdragonFight);
+        hasRaids, logicalHeight, burningBehaviourIdentifier, fixedTime, hasEnderdragonFight,
+        coordinateScale);
   }
 
   /**
    * Encodes the Dimension data as CompoundTag.
+   * @param version the version to serialize as
    * @return compound containing the dimension data
    */
-  public CompoundTag encodeAsCompundTag() {
+  public CompoundTag encodeAsCompoundTag(ProtocolVersion version) {
+    CompoundTag details = serializeDimensionDetails();
+    if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
+      CompoundTag parent = new CompoundTag();
+      parent.putString("name", registryIdentifier);
+      if (dimensionId == null) {
+        throw new IllegalStateException("Tried to serialize a 1.16.2+ dimension registry entry "
+            + "without an ID");
+      }
+      parent.putInt("id", dimensionId);
+      parent.put("element", details);
+      return parent;
+    } else {
+      details.putString("name", registryIdentifier);
+      return details;
+    }
+  }
+
+  private CompoundTag serializeDimensionDetails() {
     CompoundTag ret = new CompoundTag();
-    ret.putString("name", registryIdentifier);
     ret.putBoolean("natural", isNatural);
     ret.putFloat("ambient_light", ambientLight);
     ret.putBoolean("shrunk", isShrunk);
@@ -187,6 +235,9 @@ public final class DimensionData {
     if (createDragonFight != null) {
       ret.putBoolean("has_enderdragon_fight", createDragonFight);
     }
+    if (coordinateScale != null) {
+      ret.putDouble("coordinate_scale", coordinateScale);
+    }
     return ret;
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/connection/registry/DimensionRegistry.java

@@ -4,6 +4,7 @@ import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Maps;
 
+import com.velocitypowered.api.network.ProtocolVersion;
 import java.util.Map;
 import java.util.Set;
 
@@ -79,29 +80,24 @@ public final class DimensionRegistry {
    * Encodes the stored Dimension registry as CompoundTag.
    * @return the CompoundTag containing identifier:type mappings
    */
-  public CompoundTag encodeRegistry() {
+  public ListTag encodeRegistry(ProtocolVersion version) {
-    CompoundTag ret = new CompoundTag();
     ListTag list = new ListTag(TagType.COMPOUND);
     for (DimensionData iter : registeredDimensions.values()) {
-      list.add(iter.encodeAsCompundTag());
+      list.add(iter.encodeAsCompoundTag(version));
     }
-    ret.put("dimension", list);
+    return list;
-    return ret;
   }
 
   /**
    * Decodes a CompoundTag storing a dimension registry.
    * @param toParse CompoundTag containing a dimension registry
    */
-  public static ImmutableSet<DimensionData> fromGameData(CompoundTag toParse) {
+  public static ImmutableSet<DimensionData> fromGameData(ListTag toParse, ProtocolVersion version) {
-    Preconditions.checkNotNull(toParse, "CompoundTag cannot be null");
+    Preconditions.checkNotNull(toParse, "ListTag cannot be null");
-    Preconditions.checkArgument(toParse.contains("dimension", TagType.LIST),
-            "CompoundTag does not contain a dimension list");
-    ListTag dimensions = toParse.getList("dimension");
     ImmutableSet.Builder<DimensionData> mappings = ImmutableSet.builder();
-    for (Tag iter : dimensions) {
+    for (Tag iter : toParse) {
       if (iter instanceof CompoundTag) {
-        mappings.add(DimensionData.decodeCompoundTag((CompoundTag) iter));
+        mappings.add(DimensionData.decodeCompoundTag((CompoundTag) iter, version));
       }
     }
     return mappings.build();

proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java

@@ -7,6 +7,7 @@ import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_13;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_14;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_15;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_16;
+import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_16_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_7_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_8;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_9;
@@ -121,7 +122,8 @@ public enum StateRegistry {
           map(0x18, MINECRAFT_1_12, false),
           map(0x1D, MINECRAFT_1_13, false),
           map(0x1F, MINECRAFT_1_14, false),
-          map(0x20, MINECRAFT_1_16, false));
+          map(0x20, MINECRAFT_1_16, false),
+          map(0x21, MINECRAFT_1_16_2, false));
 
       clientbound.register(BossBar.class, BossBar::new,
           map(0x0C, MINECRAFT_1_9, false),
@@ -138,39 +140,45 @@ public enum StateRegistry {
           map(0x0E, MINECRAFT_1_9, false),
           map(0x10, MINECRAFT_1_13, false),
           map(0x11, MINECRAFT_1_15, false),
-          map(0x10, MINECRAFT_1_16, false));
+          map(0x10, MINECRAFT_1_16, false),
+          map(0x0F, MINECRAFT_1_16_2, false));
       clientbound.register(AvailableCommands.class, AvailableCommands::new,
           map(0x11, MINECRAFT_1_13, false),
           map(0x12, MINECRAFT_1_15, false),
-          map(0x11, MINECRAFT_1_16, false));
+          map(0x11, MINECRAFT_1_16, false),
+          map(0x10, MINECRAFT_1_16_2, false));
       clientbound.register(PluginMessage.class, PluginMessage::new,
           map(0x3F, MINECRAFT_1_7_2, false),
           map(0x18, MINECRAFT_1_9, false),
           map(0x19, MINECRAFT_1_13, false),
           map(0x18, MINECRAFT_1_14, false),
           map(0x19, MINECRAFT_1_15, false),
-          map(0x18, MINECRAFT_1_16, false));
+          map(0x18, MINECRAFT_1_16, false),
+          map(0x17, MINECRAFT_1_16_2, false));
       clientbound.register(Disconnect.class, Disconnect::new,
           map(0x40, MINECRAFT_1_7_2, false),
           map(0x1A, MINECRAFT_1_9, false),
           map(0x1B, MINECRAFT_1_13, false),
           map(0x1A, MINECRAFT_1_14, false),
           map(0x1B, MINECRAFT_1_15, false),
-          map(0x1A, MINECRAFT_1_16, false));
+          map(0x1A, MINECRAFT_1_16, false),
+          map(0x19, MINECRAFT_1_16_2, false));
       clientbound.register(KeepAlive.class, KeepAlive::new,
           map(0x00, MINECRAFT_1_7_2, false),
           map(0x1F, MINECRAFT_1_9, false),
           map(0x21, MINECRAFT_1_13, false),
           map(0x20, MINECRAFT_1_14, false),
           map(0x21, MINECRAFT_1_15, false),
-          map(0x20, MINECRAFT_1_16, false));
+          map(0x20, MINECRAFT_1_16, false),
+          map(0x1F, MINECRAFT_1_16_2, false));
       clientbound.register(JoinGame.class, JoinGame::new,
           map(0x01, MINECRAFT_1_7_2, false),
           map(0x23, MINECRAFT_1_9, false),
           map(0x25, MINECRAFT_1_13, false),
           map(0x25, MINECRAFT_1_14, false),
           map(0x26, MINECRAFT_1_15, false),
-          map(0x25, MINECRAFT_1_16, false));
+          map(0x25, MINECRAFT_1_16, false),
+          map(0x24, MINECRAFT_1_16_2, false));
       clientbound.register(Respawn.class, Respawn::new,
           map(0x07, MINECRAFT_1_7_2, true),
           map(0x33, MINECRAFT_1_9, true),
@@ -179,7 +187,8 @@ public enum StateRegistry {
           map(0x38, MINECRAFT_1_13, true),
           map(0x3A, MINECRAFT_1_14, true),
           map(0x3B, MINECRAFT_1_15, true),
-          map(0x3A, MINECRAFT_1_16, true));
+          map(0x3A, MINECRAFT_1_16, true),
+          map(0x39, MINECRAFT_1_16_2, true));
       clientbound.register(ResourcePackRequest.class, ResourcePackRequest::new,
           map(0x48, MINECRAFT_1_8, true),
           map(0x32, MINECRAFT_1_9, true),
@@ -188,7 +197,8 @@ public enum StateRegistry {
           map(0x37, MINECRAFT_1_13, true),
           map(0x39, MINECRAFT_1_14, true),
           map(0x3A, MINECRAFT_1_15, true),
-          map(0x39, MINECRAFT_1_16, true));
+          map(0x39, MINECRAFT_1_16, true),
+          map(0x38, MINECRAFT_1_16_2, true));
       clientbound.register(HeaderAndFooter.class, HeaderAndFooter::new,
           map(0x47, MINECRAFT_1_8, true),
           map(0x48, MINECRAFT_1_9, true),
@@ -215,7 +225,8 @@ public enum StateRegistry {
           map(0x30, MINECRAFT_1_13, false),
           map(0x33, MINECRAFT_1_14, false),
           map(0x34, MINECRAFT_1_15, false),
-          map(0x33, MINECRAFT_1_16, false));
+          map(0x33, MINECRAFT_1_16, false),
+          map(0x32, MINECRAFT_1_16_2, false));
     }
   },
   LOGIN {

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/JoinGame.java

@@ -8,6 +8,9 @@ import com.velocitypowered.proxy.connection.registry.DimensionInfo;
 import com.velocitypowered.proxy.connection.registry.DimensionRegistry;
 import com.velocitypowered.proxy.protocol.*;
 import io.netty.buffer.ByteBuf;
+import net.kyori.nbt.CompoundTag;
+import net.kyori.nbt.ListTag;
+import net.kyori.nbt.TagType;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class JoinGame implements MinecraftPacket {
@@ -17,7 +20,8 @@ public class JoinGame implements MinecraftPacket {
   private int dimension;
   private long partialHashedSeed; // 1.15+
   private short difficulty;
-  private short maxPlayers;
+  private boolean isHardcore;
+  private int maxPlayers;
   private @Nullable String levelType;
   private int viewDistance; // 1.14+
   private boolean reducedDebugInfo;
@@ -25,6 +29,7 @@ public class JoinGame implements MinecraftPacket {
   private DimensionRegistry dimensionRegistry; // 1.16+
   private DimensionInfo dimensionInfo; // 1.16+
   private short previousGamemode; // 1.16+
+  private CompoundTag biomeRegistry; // 1.16.2+
 
   public int getEntityId() {
     return entityId;
@@ -62,11 +67,11 @@ public class JoinGame implements MinecraftPacket {
     this.difficulty = difficulty;
   }
 
-  public short getMaxPlayers() {
+  public int getMaxPlayers() {
     return maxPlayers;
   }
 
-  public void setMaxPlayers(short maxPlayers) {
+  public void setMaxPlayers(int maxPlayers) {
     this.maxPlayers = maxPlayers;
   }
 
@@ -118,6 +123,23 @@ public class JoinGame implements MinecraftPacket {
     this.previousGamemode = previousGamemode;
   }
 
+  public boolean getIsHardcore() {
+    return isHardcore;
+  }
+
+  public void setIsHardcore(boolean isHardcore) {
+    this.isHardcore = isHardcore;
+  }
+
+  public CompoundTag getBiomeRegistry() {
+    return biomeRegistry;
+  }
+
+  public void setBiomeRegistry(CompoundTag biomeRegistry) {
+    this.biomeRegistry = biomeRegistry;
+  }
+
+
   @Override
   public String toString() {
     return "JoinGame{"
@@ -139,13 +161,30 @@ public class JoinGame implements MinecraftPacket {
   @Override
   public void decode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion version) {
     this.entityId = buf.readInt();
-    this.gamemode = buf.readUnsignedByte();
+    if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
+      this.isHardcore = buf.readBoolean();
+      this.gamemode = buf.readByte();
+    } else {
+      this.gamemode = buf.readByte();
+      this.isHardcore = (this.gamemode & 0x08) != 0;
+      this.gamemode &= ~0x08;
+    }
     String dimensionIdentifier = null;
     String levelName = null;
     if (version.compareTo(ProtocolVersion.MINECRAFT_1_16) >= 0) {
       this.previousGamemode = buf.readByte();
       ImmutableSet<String> levelNames = ImmutableSet.copyOf(ProtocolUtils.readStringArray(buf));
-      ImmutableSet<DimensionData> readData = DimensionRegistry.fromGameData(ProtocolUtils.readCompoundTag(buf));
+      CompoundTag registryContainer = ProtocolUtils.readCompoundTag(buf);
+      ListTag dimensionRegistryContainer = null;
+      if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
+        dimensionRegistryContainer = registryContainer.getCompound("minecraft:dimension_type")
+            .getList("value", TagType.COMPOUND);
+        this.biomeRegistry = registryContainer.getCompound("minecraft:worldgen/biome");
+      } else {
+        dimensionRegistryContainer = registryContainer.getList("dimension", TagType.COMPOUND);
+      }
+      ImmutableSet<DimensionData> readData =
+          DimensionRegistry.fromGameData(dimensionRegistryContainer, version);
       this.dimensionRegistry = new DimensionRegistry(readData, levelNames);
       dimensionIdentifier = ProtocolUtils.readString(buf);
       levelName = ProtocolUtils.readString(buf);
@@ -160,7 +199,11 @@ public class JoinGame implements MinecraftPacket {
     if (version.compareTo(ProtocolVersion.MINECRAFT_1_15) >= 0) {
       this.partialHashedSeed = buf.readLong();
     }
+    if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
+      this.maxPlayers = ProtocolUtils.readVarInt(buf);
+    } else {
       this.maxPlayers = buf.readUnsignedByte();
+    }
     if (version.compareTo(ProtocolVersion.MINECRAFT_1_16) < 0) {
       this.levelType = ProtocolUtils.readString(buf, 16);
     }
@@ -183,12 +226,28 @@ public class JoinGame implements MinecraftPacket {
   @Override
   public void encode(ByteBuf buf, ProtocolUtils.Direction direction, ProtocolVersion version) {
     buf.writeInt(entityId);
+    if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
+      buf.writeBoolean(isHardcore);
       buf.writeByte(gamemode);
+    } else {
+      buf.writeByte(isHardcore ? gamemode | 0x8 : gamemode);
+    }
     if (version.compareTo(ProtocolVersion.MINECRAFT_1_16) >= 0) {
       buf.writeByte(previousGamemode);
       ProtocolUtils.writeStringArray(buf, dimensionRegistry.getLevelNames().toArray(
           new String[dimensionRegistry.getLevelNames().size()]));
-      ProtocolUtils.writeCompoundTag(buf, dimensionRegistry.encodeRegistry());
+      CompoundTag registryContainer = new CompoundTag();
+      ListTag encodedDimensionRegistry = dimensionRegistry.encodeRegistry(version);
+      if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
+        CompoundTag dimensionRegistryDummy = new CompoundTag();
+        dimensionRegistryDummy.putString("type", "minecraft:dimension_type");
+        dimensionRegistryDummy.put("value", encodedDimensionRegistry);
+        registryContainer.put("minecraft:dimension_type", dimensionRegistryDummy);
+        registryContainer.put("minecraft:worldgen/biome", biomeRegistry);
+      } else {
+        registryContainer.put("dimension", encodedDimensionRegistry);
+      }
+      ProtocolUtils.writeCompoundTag(buf, registryContainer);
       ProtocolUtils.writeString(buf, dimensionInfo.getRegistryIdentifier());
       ProtocolUtils.writeString(buf, dimensionInfo.getLevelName());
     } else if (version.compareTo(ProtocolVersion.MINECRAFT_1_9_1) >= 0) {
@@ -202,7 +261,11 @@ public class JoinGame implements MinecraftPacket {
     if (version.compareTo(ProtocolVersion.MINECRAFT_1_15) >= 0) {
       buf.writeLong(partialHashedSeed);
     }
+    if (version.compareTo(ProtocolVersion.MINECRAFT_1_16_2) >= 0) {
+      ProtocolUtils.writeVarInt(buf, maxPlayers);
+    } else {
       buf.writeByte(maxPlayers);
+    }
     if (version.compareTo(ProtocolVersion.MINECRAFT_1_16) < 0) {
       if (levelType == null) {
         throw new IllegalStateException("No level type specified.");

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/brigadier/ArgumentPropertyRegistry.java

@@ -135,5 +135,6 @@ public class ArgumentPropertyRegistry {
     dummy("minecraft:float_range", DUMMY);
     dummy("minecraft:time", DUMMY); // added in 1.14
     dummy("minecraft:uuid", DUMMY); // added in 1.16
+    dummy("minecraft:angle", DUMMY); // added in 1.16.2
   }
 }