[BUG] Can't join game crashes out

[BurkenDev]

Prerequisites

• I made sure I am running the latest development build
• I tried to look for similar issues before opening a new one
• I have set debugmessages=true in config to diagnose my issue
• I have redacted session tokens and passwords before attaching screenshots

Minecraft Version

1.21

Console Client Version

20240713-273

Expected Behavior

Join and stay online and not crash out 1 second after joining the server??

Actual Behavior

Unhandled exception. System.IO.InvalidDataException: Failed to process incoming packet of type JoinGame. (PacketID: 40, Protocol: 763, LoginPhase: False, InnerException: System.Collections.Generic.KeyNotFoundException).
---> System.Collections.Generic.KeyNotFoundException: The given key 'minecraft:chat_type' was not present in the dictionary.
at System.Collections.Generic.Dictionary2.get_Item(TKey key) at MinecraftClient.Protocol.Message.ChatParser.ReadChatType(Dictionary2 registryCodec)
at MinecraftClient.Protocol.Handlers.Protocol18Handler.HandlePlayPackets(Int32 packetId, Queue1 packetData) at MinecraftClient.Protocol.Handlers.Protocol18Handler.HandlePacket(Int32 packetId, Queue1 packetData)
--- End of inner exception stack trace ---
at MinecraftClient.Protocol.Handlers.Protocol18Handler.HandlePacket(Int32 packetId, Queue`1 packetData)
at MinecraftClient.Protocol.Handlers.Protocol18Handler.Updater(Object o)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
Aborted

Steps to Reproduce the bug

./MinecraftClient-20240713-273-linux-x64

Attach screenshot here (If applicable)

No response

Anythings that could help diagnosing the bug

No response

Device

Other

Operating System

Linux

Server Address (If applicable)

No response

[milutinke]

1.21 is not supported yet.
It will be when I have the time to finish 1.20.6 (porting it to 1.21 will be quick).