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

@@ -87,7 +87,8 @@ public enum ProtocolVersion implements Ordered<ProtocolVersion> {
   MINECRAFT_1_20_2(764, "1.20.2"),
   MINECRAFT_1_20_3(765, "1.20.3", "1.20.4"),
   MINECRAFT_1_20_5(766, "1.20.5", "1.20.6"),
-  MINECRAFT_1_21(767, "1.21", "1.21.1");
+  MINECRAFT_1_21(767, "1.21", "1.21.1"),
+  MINECRAFT_1_21_2(768, "1.21.2");
 
   private static final int SNAPSHOT_BIT = 30;
 

api/src/main/java/com/velocitypowered/api/proxy/player/PlayerSettings.java

@@ -68,6 +68,20 @@ public interface PlayerSettings {
    */
   boolean isClientListingAllowed();
 
+  /**
+   * Returns if the client has text filtering enabled.
+   *
+   * @return if text filtering is enabled
+   */
+  boolean isTextFilteringEnabled();
+
+  /**
+   * Returns the selected "Particles" option state.
+   *
+   * @return the particle option
+   */
+  ParticleStatus getParticleStatus();
+
   /**
    * The client's current chat display mode.
    */
@@ -84,4 +98,13 @@ public interface PlayerSettings {
     LEFT,
     RIGHT
   }
+
+  /**
+   * The client's current "Particles" option state.
+   */
+  enum ParticleStatus {
+    ALL,
+    DECREASED,
+    MINIMAL
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ClientSettingsWrapper.java

@@ -30,7 +30,7 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public class ClientSettingsWrapper implements PlayerSettings {
 
   static final PlayerSettings DEFAULT = new ClientSettingsWrapper(
-      new ClientSettingsPacket("en_US", (byte) 10, 0, true, (short) 127, 1, true, false));
+      new ClientSettingsPacket("en_us", (byte) 2, 0, true, (short) 0, 1, false, false, 0));
 
   private final ClientSettingsPacket settings;
   private final SkinParts parts;
@@ -56,11 +56,11 @@ public class ClientSettingsWrapper implements PlayerSettings {
 
   @Override
   public ChatMode getChatMode() {
-    int chat = settings.getChatVisibility();
+    return switch (settings.getChatVisibility()) {
-    if (chat < 0 || chat > 2) {
+      case 1 -> ChatMode.COMMANDS_ONLY;
-      return ChatMode.SHOWN;
+      case 2 -> ChatMode.HIDDEN;
-    }
+      default -> ChatMode.SHOWN;
-    return ChatMode.values()[chat];
+    };
   }
 
   @Override
@@ -83,6 +83,20 @@ public class ClientSettingsWrapper implements PlayerSettings {
     return settings.isClientListingAllowed();
   }
 
+  @Override
+  public boolean isTextFilteringEnabled() {
+    return settings.isTextFilteringEnabled();
+  }
+
+  @Override
+  public ParticleStatus getParticleStatus() {
+    return switch (settings.getParticleStatus()) {
+      case 1 -> ParticleStatus.DECREASED;
+      case 2 -> ParticleStatus.MINIMAL;
+      default -> ParticleStatus.ALL;
+    };
+  }
+
   @Override
   public boolean equals(@Nullable final Object o) {
     if (this == o) {

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

@@ -37,6 +37,7 @@ import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_2;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_3;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_20_5;
 import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21;
+import static com.velocitypowered.api.network.ProtocolVersion.MINECRAFT_1_21_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;
@@ -252,7 +253,8 @@ public enum StateRegistry {
           map(0x08, MINECRAFT_1_19_3, false),
           map(0x09, MINECRAFT_1_19_4, false),
           map(0x0A, MINECRAFT_1_20_2, false),
-          map(0x0B, MINECRAFT_1_20_5, false));
+          map(0x0B, MINECRAFT_1_20_5, false),
+          map(0x0D, MINECRAFT_1_21_2, false));
       serverbound.register(
           LegacyChatPacket.class,
           LegacyChatPacket::new,
@@ -264,7 +266,8 @@ public enum StateRegistry {
       serverbound.register(
           ChatAcknowledgementPacket.class,
           ChatAcknowledgementPacket::new,
-          map(0x03, MINECRAFT_1_19_3, false));
+          map(0x03, MINECRAFT_1_19_3, false),
+          map(0x04, MINECRAFT_1_21_2, false));
       serverbound.register(KeyedPlayerCommandPacket.class, KeyedPlayerCommandPacket::new,
           map(0x03, MINECRAFT_1_19, false),
           map(0x04, MINECRAFT_1_19_1, MINECRAFT_1_19_1, false));
@@ -273,14 +276,17 @@ public enum StateRegistry {
           map(0x05, MINECRAFT_1_19_1, MINECRAFT_1_19_1, false));
       serverbound.register(SessionPlayerCommandPacket.class, SessionPlayerCommandPacket::new,
           map(0x04, MINECRAFT_1_19_3, false),
-          map(0x05, MINECRAFT_1_20_5, false));
+          map(0x05, MINECRAFT_1_20_5, false),
+          map(0x06, MINECRAFT_1_21_2, false));
       serverbound.register(UnsignedPlayerCommandPacket.class, UnsignedPlayerCommandPacket::new,
-          map(0x04, MINECRAFT_1_20_5, false));
+          map(0x04, MINECRAFT_1_20_5, false),
+          map(0x05, MINECRAFT_1_21_2, false));
       serverbound.register(
           SessionPlayerChatPacket.class,
           SessionPlayerChatPacket::new,
           map(0x05, MINECRAFT_1_19_3, false),
-          map(0x06, MINECRAFT_1_20_5, false));
+          map(0x06, MINECRAFT_1_20_5, false),
+          map(0x07, MINECRAFT_1_21_2, false));
       serverbound.register(
           ClientSettingsPacket.class,
           ClientSettingsPacket::new,
@@ -294,10 +300,12 @@ public enum StateRegistry {
           map(0x07, MINECRAFT_1_19_3, false),
           map(0x08, MINECRAFT_1_19_4, false),
           map(0x09, MINECRAFT_1_20_2, false),
-          map(0x0A, MINECRAFT_1_20_5, false));
+          map(0x0A, MINECRAFT_1_20_5, false),
+          map(0x0C, MINECRAFT_1_21_2, false));
       serverbound.register(
           ServerboundCookieResponsePacket.class, ServerboundCookieResponsePacket::new,
-          map(0x11, MINECRAFT_1_20_5, false));
+          map(0x11, MINECRAFT_1_20_5, false),
+          map(0x13, MINECRAFT_1_21_2, false));
       serverbound.register(
           PluginMessagePacket.class,
           PluginMessagePacket::new,
@@ -314,7 +322,8 @@ public enum StateRegistry {
           map(0x0D, MINECRAFT_1_19_4, false),
           map(0x0F, MINECRAFT_1_20_2, false),
           map(0x10, MINECRAFT_1_20_3, false),
-          map(0x12, MINECRAFT_1_20_5, false));
+          map(0x12, MINECRAFT_1_20_5, false),
+          map(0x14, MINECRAFT_1_21_2, false));
       serverbound.register(
           KeepAlivePacket.class,
           KeepAlivePacket::new,
@@ -332,7 +341,8 @@ public enum StateRegistry {
           map(0x12, MINECRAFT_1_19_4, false),
           map(0x14, MINECRAFT_1_20_2, false),
           map(0x15, MINECRAFT_1_20_3, false),
-          map(0x18, MINECRAFT_1_20_5, false));
+          map(0x18, MINECRAFT_1_20_5, false),
+          map(0x1A, MINECRAFT_1_21_2, false));
       serverbound.register(
           ResourcePackResponsePacket.class,
           ResourcePackResponsePacket::new,
@@ -347,11 +357,13 @@ public enum StateRegistry {
           map(0x24, MINECRAFT_1_19_1, false),
           map(0x27, MINECRAFT_1_20_2, false),
           map(0x28, MINECRAFT_1_20_3, false),
-          map(0x2B, MINECRAFT_1_20_5, false));
+          map(0x2B, MINECRAFT_1_20_5, false),
+          map(0x2D, MINECRAFT_1_21_2, false));
       serverbound.register(
           FinishedUpdatePacket.class, () -> FinishedUpdatePacket.INSTANCE,
           map(0x0B, MINECRAFT_1_20_2, false),
-          map(0x0C, MINECRAFT_1_20_5, false));
+          map(0x0C, MINECRAFT_1_20_5, false),
+          map(0x0E, MINECRAFT_1_21_2, false));
 
       clientbound.register(
           BossBarPacket.class,
@@ -449,7 +461,8 @@ public enum StateRegistry {
           map(0x1F, MINECRAFT_1_19_3, false),
           map(0x23, MINECRAFT_1_19_4, false),
           map(0x24, MINECRAFT_1_20_2, false),
-          map(0x26, MINECRAFT_1_20_5, false));
+          map(0x26, MINECRAFT_1_20_5, false),
+          map(0x27, MINECRAFT_1_21_2, false));
       clientbound.register(
           JoinGamePacket.class,
           JoinGamePacket::new,
@@ -466,7 +479,8 @@ public enum StateRegistry {
           map(0x24, MINECRAFT_1_19_3, false),
           map(0x28, MINECRAFT_1_19_4, false),
           map(0x29, MINECRAFT_1_20_2, false),
-          map(0x2B, MINECRAFT_1_20_5, false));
+          map(0x2B, MINECRAFT_1_20_5, false),
+          map(0x2C, MINECRAFT_1_21_2, false));
       clientbound.register(
           RespawnPacket.class,
           RespawnPacket::new,
@@ -486,12 +500,14 @@ public enum StateRegistry {
           map(0x41, MINECRAFT_1_19_4, true),
           map(0x43, MINECRAFT_1_20_2, true),
           map(0x45, MINECRAFT_1_20_3, true),
-          map(0x47, MINECRAFT_1_20_5, true));
+          map(0x47, MINECRAFT_1_20_5, true),
+          map(0x4C, MINECRAFT_1_21_2, true));
       clientbound.register(
           RemoveResourcePackPacket.class,
           RemoveResourcePackPacket::new,
           map(0x43, MINECRAFT_1_20_3, false),
-          map(0x45, MINECRAFT_1_20_5, false));
+          map(0x45, MINECRAFT_1_20_5, false),
+          map(0x4A, MINECRAFT_1_21_2, false));
       clientbound.register(
           ResourcePackRequestPacket.class,
           ResourcePackRequestPacket::new,
@@ -511,7 +527,8 @@ public enum StateRegistry {
           map(0x40, MINECRAFT_1_19_4, false),
           map(0x42, MINECRAFT_1_20_2, false),
           map(0x44, MINECRAFT_1_20_3, false),
-          map(0x46, MINECRAFT_1_20_5, false));
+          map(0x46, MINECRAFT_1_20_5, false),
+          map(0x4B, MINECRAFT_1_21_2, false));
       clientbound.register(
           HeaderAndFooterPacket.class,
           HeaderAndFooterPacket::new,
@@ -532,7 +549,8 @@ public enum StateRegistry {
           map(0x65, MINECRAFT_1_19_4, true),
           map(0x68, MINECRAFT_1_20_2, true),
           map(0x6A, MINECRAFT_1_20_3, true),
-          map(0x6D, MINECRAFT_1_20_5, true));
+          map(0x6D, MINECRAFT_1_20_5, true),
+          map(0x74, MINECRAFT_1_21_2, true));
       clientbound.register(
           LegacyTitlePacket.class,
           LegacyTitlePacket::new,
@@ -552,7 +570,8 @@ public enum StateRegistry {
           map(0x5D, MINECRAFT_1_19_4, true),
           map(0x5F, MINECRAFT_1_20_2, true),
           map(0x61, MINECRAFT_1_20_3, true),
-          map(0x63, MINECRAFT_1_20_5, true));
+          map(0x63, MINECRAFT_1_20_5, true),
+          map(0x6A, MINECRAFT_1_21_2, true));
       clientbound.register(
           TitleTextPacket.class,
           TitleTextPacket::new,
@@ -563,7 +582,8 @@ public enum StateRegistry {
           map(0x5F, MINECRAFT_1_19_4, true),
           map(0x61, MINECRAFT_1_20_2, true),
           map(0x63, MINECRAFT_1_20_3, true),
-          map(0x65, MINECRAFT_1_20_5, true));
+          map(0x65, MINECRAFT_1_20_5, true),
+          map(0x6C, MINECRAFT_1_21_2, true));
       clientbound.register(
           TitleActionbarPacket.class,
           TitleActionbarPacket::new,
@@ -574,7 +594,8 @@ public enum StateRegistry {
           map(0x46, MINECRAFT_1_19_4, true),
           map(0x48, MINECRAFT_1_20_2, true),
           map(0x4A, MINECRAFT_1_20_3, true),
-          map(0x4C, MINECRAFT_1_20_5, true));
+          map(0x4C, MINECRAFT_1_20_5, true),
+          map(0x51, MINECRAFT_1_21_2, true));
       clientbound.register(
           TitleTimesPacket.class,
           TitleTimesPacket::new,
@@ -585,7 +606,8 @@ public enum StateRegistry {
           map(0x60, MINECRAFT_1_19_4, true),
           map(0x62, MINECRAFT_1_20_2, true),
           map(0x64, MINECRAFT_1_20_3, true),
-          map(0x66, MINECRAFT_1_20_5, true));
+          map(0x66, MINECRAFT_1_20_5, true),
+          map(0x6D, MINECRAFT_1_21_2, true));
       clientbound.register(
           TitleClearPacket.class,
           TitleClearPacket::new,
@@ -612,17 +634,20 @@ public enum StateRegistry {
           map(0x35, MINECRAFT_1_19_3, false),
           map(0x39, MINECRAFT_1_19_4, false),
           map(0x3B, MINECRAFT_1_20_2, false),
-          map(0x3D, MINECRAFT_1_20_5, false));
+          map(0x3D, MINECRAFT_1_20_5, false),
+          map(0x3F, MINECRAFT_1_21_2, false));
       clientbound.register(
           UpsertPlayerInfoPacket.class,
           UpsertPlayerInfoPacket::new,
           map(0x36, MINECRAFT_1_19_3, false),
           map(0x3A, MINECRAFT_1_19_4, false),
           map(0x3C, MINECRAFT_1_20_2, false),
-          map(0x3E, MINECRAFT_1_20_5, false));
+          map(0x3E, MINECRAFT_1_20_5, false),
+          map(0x40, MINECRAFT_1_21_2, false));
       clientbound.register(
           ClientboundStoreCookiePacket.class, ClientboundStoreCookiePacket::new,
-          map(0x6B, MINECRAFT_1_20_5, false));
+          map(0x6B, MINECRAFT_1_20_5, false),
+          map(0x72, MINECRAFT_1_21_2, false));
       clientbound.register(
           SystemChatPacket.class,
           SystemChatPacket::new,
@@ -632,7 +657,8 @@ public enum StateRegistry {
           map(0x64, MINECRAFT_1_19_4, true),
           map(0x67, MINECRAFT_1_20_2, true),
           map(0x69, MINECRAFT_1_20_3, true),
-          map(0x6C, MINECRAFT_1_20_5, true));
+          map(0x6C, MINECRAFT_1_20_5, true),
+          map(0x73, MINECRAFT_1_21_2, true));
       clientbound.register(
           PlayerChatCompletionPacket.class,
           PlayerChatCompletionPacket::new,
@@ -650,13 +676,15 @@ public enum StateRegistry {
           map(0x45, MINECRAFT_1_19_4, false),
           map(0x47, MINECRAFT_1_20_2, false),
           map(0x49, MINECRAFT_1_20_3, false),
-          map(0x4B, MINECRAFT_1_20_5, false));
+          map(0x4B, MINECRAFT_1_20_5, false),
+          map(0x50, MINECRAFT_1_21_2, false));
       clientbound.register(
           StartUpdatePacket.class,
           () -> StartUpdatePacket.INSTANCE,
           map(0x65, MINECRAFT_1_20_2, false),
           map(0x67, MINECRAFT_1_20_3, false),
-          map(0x69, MINECRAFT_1_20_5, false));
+          map(0x69, MINECRAFT_1_20_5, false),
+          map(0x70, MINECRAFT_1_21_2, false));
       clientbound.register(
           BundleDelimiterPacket.class,
           () -> BundleDelimiterPacket.INSTANCE,
@@ -664,12 +692,18 @@ public enum StateRegistry {
       clientbound.register(
           TransferPacket.class,
           TransferPacket::new,
-          map(0x73, MINECRAFT_1_20_5, false)
+          map(0x73, MINECRAFT_1_20_5, false),
-      );
+          map(0x7A, MINECRAFT_1_21_2, false));
-      clientbound.register(ClientboundCustomReportDetailsPacket.class, ClientboundCustomReportDetailsPacket::new,
+      clientbound.register(
-              map(0x7A, MINECRAFT_1_21, false));
+          ClientboundCustomReportDetailsPacket.class,
-      clientbound.register(ClientboundServerLinksPacket.class, ClientboundServerLinksPacket::new,
+          ClientboundCustomReportDetailsPacket::new,
-              map(0x7B, MINECRAFT_1_21, false));
+          map(0x7A, MINECRAFT_1_21, false),
+          map(0x81, MINECRAFT_1_21_2, false));
+      clientbound.register(
+          ClientboundServerLinksPacket.class,
+          ClientboundServerLinksPacket::new,
+          map(0x7B, MINECRAFT_1_21, false),
+          map(0x82, MINECRAFT_1_21_2, false));
     }
   },
   LOGIN {

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

@@ -34,21 +34,25 @@ public class ClientSettingsPacket implements MinecraftPacket {
   private byte difficulty; // 1.7 Protocol
   private short skinParts;
   private int mainHand;
-  private boolean chatFilteringEnabled; // Added in 1.17
+  private boolean textFilteringEnabled; // Added in 1.17
   private boolean clientListingAllowed; // Added in 1.18, overwrites server-list "anonymous" mode
+  private int particleStatus; // Added in 1.21.2
 
   public ClientSettingsPacket() {
   }
 
   public ClientSettingsPacket(String locale, byte viewDistance, int chatVisibility, boolean chatColors,
-                              short skinParts, int mainHand, boolean chatFilteringEnabled, boolean clientListingAllowed) {
+                              short skinParts, int mainHand, boolean textFilteringEnabled, boolean clientListingAllowed,
+                              int particleStatus) {
     this.locale = locale;
     this.viewDistance = viewDistance;
     this.chatVisibility = chatVisibility;
     this.chatColors = chatColors;
     this.skinParts = skinParts;
     this.mainHand = mainHand;
+    this.textFilteringEnabled = textFilteringEnabled;
     this.clientListingAllowed = clientListingAllowed;
+    this.particleStatus = particleStatus;
   }
 
   public String getLocale() {
@@ -102,12 +106,12 @@ public class ClientSettingsPacket implements MinecraftPacket {
     this.mainHand = mainHand;
   }
 
-  public boolean isChatFilteringEnabled() {
+  public boolean isTextFilteringEnabled() {
-    return chatFilteringEnabled;
+    return textFilteringEnabled;
   }
 
-  public void setChatFilteringEnabled(boolean chatFilteringEnabled) {
+  public void setTextFilteringEnabled(boolean textFilteringEnabled) {
-    this.chatFilteringEnabled = chatFilteringEnabled;
+    this.textFilteringEnabled = textFilteringEnabled;
   }
 
   public boolean isClientListingAllowed() {
@@ -118,12 +122,20 @@ public class ClientSettingsPacket implements MinecraftPacket {
     this.clientListingAllowed = clientListingAllowed;
   }
 
+  public int getParticleStatus() {
+    return particleStatus;
+  }
+
+  public void setParticleStatus(int particleStatus) {
+    this.particleStatus = particleStatus;
+  }
+
   @Override
   public String toString() {
     return "ClientSettings{" + "locale='" + locale + '\'' + ", viewDistance=" + viewDistance +
         ", chatVisibility=" + chatVisibility + ", chatColors=" + chatColors + ", skinParts=" +
-        skinParts + ", mainHand=" + mainHand + ", chatFilteringEnabled=" + chatFilteringEnabled +
+        skinParts + ", mainHand=" + mainHand + ", chatFilteringEnabled=" + textFilteringEnabled +
-        ", clientListingAllowed=" + clientListingAllowed + '}';
+        ", clientListingAllowed=" + clientListingAllowed +  ", particleStatus=" + particleStatus + '}';
   }
 
   @Override
@@ -143,10 +155,14 @@ public class ClientSettingsPacket implements MinecraftPacket {
       this.mainHand = ProtocolUtils.readVarInt(buf);
 
       if (version.noLessThan(ProtocolVersion.MINECRAFT_1_17)) {
-        this.chatFilteringEnabled = buf.readBoolean();
+        this.textFilteringEnabled = buf.readBoolean();
 
         if (version.noLessThan(ProtocolVersion.MINECRAFT_1_18)) {
           this.clientListingAllowed = buf.readBoolean();
+
+          if (version.noLessThan(ProtocolVersion.MINECRAFT_1_21_2)) {
+            this.particleStatus = ProtocolUtils.readVarInt(buf);
+          }
         }
       }
     }
@@ -172,11 +188,15 @@ public class ClientSettingsPacket implements MinecraftPacket {
       ProtocolUtils.writeVarInt(buf, mainHand);
 
       if (version.noLessThan(ProtocolVersion.MINECRAFT_1_17)) {
-        buf.writeBoolean(chatFilteringEnabled);
+        buf.writeBoolean(textFilteringEnabled);
 
         if (version.noLessThan(ProtocolVersion.MINECRAFT_1_18)) {
           buf.writeBoolean(clientListingAllowed);
         }
+
+        if (version.noLessThan(ProtocolVersion.MINECRAFT_1_21_2)) {
+          ProtocolUtils.writeVarInt(buf, particleStatus);
+        }
       }
     }
   }
@@ -201,8 +221,9 @@ public class ClientSettingsPacket implements MinecraftPacket {
         && difficulty == that.difficulty
         && skinParts == that.skinParts
         && mainHand == that.mainHand
-        && chatFilteringEnabled == that.chatFilteringEnabled
+        && textFilteringEnabled == that.textFilteringEnabled
         && clientListingAllowed == that.clientListingAllowed
+        && particleStatus == that.particleStatus
         && Objects.equals(locale, that.locale);
   }
 
@@ -216,7 +237,8 @@ public class ClientSettingsPacket implements MinecraftPacket {
         difficulty,
         skinParts,
         mainHand,
-        chatFilteringEnabled,
+            textFilteringEnabled,
-        clientListingAllowed);
+        clientListingAllowed,
+        particleStatus);
   }
 }

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

@@ -51,6 +51,7 @@ public class JoinGamePacket implements MinecraftPacket {
   private int simulationDistance; // 1.18+
   private @Nullable Pair<String, Long> lastDeathPosition; // 1.19+
   private int portalCooldown; // 1.20+
+  private int seaLevel; // 1.21.2+
   private boolean enforcesSecureChat; // 1.20.5+
 
   public int getEntityId() {
@@ -181,6 +182,14 @@ public class JoinGamePacket implements MinecraftPacket {
     this.portalCooldown = portalCooldown;
   }
 
+  public int getSeaLevel() {
+    return seaLevel;
+  }
+
+  public void setSeaLevel(int seaLevel) {
+    this.seaLevel = seaLevel;
+  }
+
   public boolean getEnforcesSecureChat() {
     return this.enforcesSecureChat;
   }
@@ -204,6 +213,7 @@ public class JoinGamePacket implements MinecraftPacket {
         dimensionInfo + '\'' + ", currentDimensionData='" + currentDimensionData + '\'' +
         ", previousGamemode=" + previousGamemode + ", simulationDistance=" + simulationDistance +
         ", lastDeathPosition='" + lastDeathPosition + '\'' + ", portalCooldown=" + portalCooldown +
+        ", seaLevel=" + seaLevel +
         '}';
   }
 
@@ -343,6 +353,11 @@ public class JoinGamePacket implements MinecraftPacket {
     }
 
     this.portalCooldown = ProtocolUtils.readVarInt(buf);
+
+    if (version.noLessThan(ProtocolVersion.MINECRAFT_1_21_2)) {
+      this.seaLevel = ProtocolUtils.readVarInt(buf);
+    }
+
     if (version.noLessThan(ProtocolVersion.MINECRAFT_1_20_5)) {
       this.enforcesSecureChat = buf.readBoolean();
     }
@@ -491,6 +506,10 @@ public class JoinGamePacket implements MinecraftPacket {
 
     ProtocolUtils.writeVarInt(buf, portalCooldown);
 
+    if (version.noLessThan(ProtocolVersion.MINECRAFT_1_21_2)) {
+      ProtocolUtils.writeVarInt(buf, seaLevel);
+    }
+
     if (version.noLessThan(ProtocolVersion.MINECRAFT_1_20_5)) {
       buf.writeBoolean(this.enforcesSecureChat);
     }

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

@@ -41,6 +41,7 @@ public class RespawnPacket implements MinecraftPacket {
   private CompoundBinaryTag currentDimensionData; // 1.16.2+
   private @Nullable Pair<String, Long> lastDeathPosition; // 1.19+
   private int portalCooldown; // 1.20+
+  private int seaLevel; // 1.21.2+
 
   public RespawnPacket() {
   }
@@ -48,7 +49,8 @@ public class RespawnPacket implements MinecraftPacket {
   public RespawnPacket(int dimension, long partialHashedSeed, short difficulty, short gamemode,
                        String levelType, byte dataToKeep, DimensionInfo dimensionInfo,
                        short previousGamemode, CompoundBinaryTag currentDimensionData,
-                       @Nullable Pair<String, Long> lastDeathPosition, int portalCooldown) {
+                       @Nullable Pair<String, Long> lastDeathPosition, int portalCooldown,
+                       int seaLevel) {
     this.dimension = dimension;
     this.partialHashedSeed = partialHashedSeed;
     this.difficulty = difficulty;
@@ -60,13 +62,15 @@ public class RespawnPacket implements MinecraftPacket {
     this.currentDimensionData = currentDimensionData;
     this.lastDeathPosition = lastDeathPosition;
     this.portalCooldown = portalCooldown;
+    this.seaLevel = seaLevel;
   }
 
   public static RespawnPacket fromJoinGame(JoinGamePacket joinGame) {
     return new RespawnPacket(joinGame.getDimension(), joinGame.getPartialHashedSeed(),
         joinGame.getDifficulty(), joinGame.getGamemode(), joinGame.getLevelType(),
         (byte) 0, joinGame.getDimensionInfo(), joinGame.getPreviousGamemode(),
-        joinGame.getCurrentDimensionData(), joinGame.getLastDeathPosition(), joinGame.getPortalCooldown());
+        joinGame.getCurrentDimensionData(), joinGame.getLastDeathPosition(),
+        joinGame.getPortalCooldown(), joinGame.getSeaLevel());
   }
 
   public int getDimension() {
@@ -141,6 +145,14 @@ public class RespawnPacket implements MinecraftPacket {
     this.portalCooldown = portalCooldown;
   }
 
+  public int getSeaLevel() {
+    return seaLevel;
+  }
+
+  public void setSeaLevel(int seaLevel) {
+    this.seaLevel = seaLevel;
+  }
+
   @Override
   public String toString() {
     return "Respawn{"
@@ -155,6 +167,7 @@ public class RespawnPacket implements MinecraftPacket {
         + ", previousGamemode=" + previousGamemode
         + ", dimensionData=" + currentDimensionData
         + ", portalCooldown=" + portalCooldown
+        + ", seaLevel=" + seaLevel
         + '}';
   }
 
@@ -204,6 +217,9 @@ public class RespawnPacket implements MinecraftPacket {
     if (version.noLessThan(ProtocolVersion.MINECRAFT_1_20)) {
       this.portalCooldown = ProtocolUtils.readVarInt(buf);
     }
+    if (version.noLessThan(ProtocolVersion.MINECRAFT_1_21_2)) {
+      this.seaLevel = ProtocolUtils.readVarInt(buf);
+    }
     if (version.noLessThan(ProtocolVersion.MINECRAFT_1_20_2)) {
       this.dataToKeep = buf.readByte();
     }
@@ -262,6 +278,10 @@ public class RespawnPacket implements MinecraftPacket {
       ProtocolUtils.writeVarInt(buf, portalCooldown);
     }
 
+    if (version.noLessThan(ProtocolVersion.MINECRAFT_1_12_1)) {
+      ProtocolUtils.writeVarInt(buf, seaLevel);
+    }
+
     if (version.noLessThan(ProtocolVersion.MINECRAFT_1_20_2)) {
       buf.writeByte(dataToKeep);
     }

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

@@ -188,6 +188,11 @@ public class UpsertPlayerInfoPacket implements MinecraftPacket {
       if (info.displayName != null) {
         info.displayName.write(buf);
       }
+    }),
+    UPDATE_LIST_ORDER((version, buf, info) -> { // read
+      info.listOrder = ProtocolUtils.readVarInt(buf);
+    }, (version, buf, info) -> { // write
+      ProtocolUtils.writeVarInt(buf, info.listOrder);
     });
 
     private final Read read;
@@ -218,6 +223,7 @@ public class UpsertPlayerInfoPacket implements MinecraftPacket {
     private int gameMode;
     @Nullable
     private ComponentHolder displayName;
+    private int listOrder;
     @Nullable
     private RemoteChatSession chatSession;
 
@@ -250,6 +256,10 @@ public class UpsertPlayerInfoPacket implements MinecraftPacket {
       return displayName;
     }
 
+    public int getListOrder() {
+      return listOrder;
+    }
+
     @Nullable
     public RemoteChatSession getChatSession() {
       return chatSession;
@@ -275,6 +285,10 @@ public class UpsertPlayerInfoPacket implements MinecraftPacket {
       this.displayName = displayName;
     }
 
+    public void setListOrder(int listOrder) {
+      this.listOrder = listOrder;
+    }
+
     public void setChatSession(@Nullable RemoteChatSession chatSession) {
       this.chatSession = chatSession;
     }
@@ -288,6 +302,7 @@ public class UpsertPlayerInfoPacket implements MinecraftPacket {
           ", latency=" + latency +
           ", gameMode=" + gameMode +
           ", displayName=" + displayName +
+          ", listOrder=" + listOrder +
           ", chatSession=" + chatSession +
           '}';
     }