diff --git a/protocol/src/main/java/net/md_5/bungee/protocol/ProtocolConstants.java b/protocol/src/main/java/net/md_5/bungee/protocol/ProtocolConstants.java
index b53b1e50ff..9028dc1303 100644
--- a/protocol/src/main/java/net/md_5/bungee/protocol/ProtocolConstants.java
+++ b/protocol/src/main/java/net/md_5/bungee/protocol/ProtocolConstants.java
@@ -47,7 +47,7 @@ public class ProtocolConstants
     public static final int MINECRAFT_1_20_3 = 765;
     public static final int MINECRAFT_1_20_5 = 766;
     public static final int MINECRAFT_1_21 = 767;
-    public static final int MINECRAFT_1_21_2 = 1073742032;
+    public static final int MINECRAFT_1_21_2 = 1073742034;
     public static final List<String> SUPPORTED_VERSIONS;
     public static final List<Integer> SUPPORTED_VERSION_IDS;
 
diff --git a/protocol/src/main/java/net/md_5/bungee/protocol/packet/LoginSuccess.java b/protocol/src/main/java/net/md_5/bungee/protocol/packet/LoginSuccess.java
index 60ff5700c9..daa6d18306 100644
--- a/protocol/src/main/java/net/md_5/bungee/protocol/packet/LoginSuccess.java
+++ b/protocol/src/main/java/net/md_5/bungee/protocol/packet/LoginSuccess.java
@@ -37,7 +37,7 @@ public void read(ByteBuf buf, ProtocolConstants.Direction direction, int protoco
         {
             properties = readProperties( buf );
         }
-        if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_5 )
+        if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_5 && protocolVersion < ProtocolConstants.MINECRAFT_1_21_2 )
         {
             // Whether the client should disconnect on its own if it receives invalid data from the server
             buf.readBoolean();
@@ -59,7 +59,7 @@ public void write(ByteBuf buf, ProtocolConstants.Direction direction, int protoc
         {
             writeProperties( properties, buf );
         }
-        if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_5 )
+        if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_5 && protocolVersion < ProtocolConstants.MINECRAFT_1_21_2 )
         {
             // Whether the client should disconnect on its own if it receives invalid data from the server
             // Vanilla sends true so we also send true