Packet detection disconnects the client when receiving any player chat message

[rfin0]

Checklist

• This is not a support or help request.
• This issue exists on the latest release for my Minecraft version.
• This issue has not already been reported.
• I have determined the minimal reproduction requirements.

Mod Loader

Fabric

Minecraft Version

26.1.2

Mod Version

3.102.5+26.1.2

Log File

https://mclo.gs/qhs7n7H

Crash Report (optional)

No response

Issue Description

When the Detect setting is set to Packet, the client disconnects with a Network Protocol Error upon receiving any player chat message.
The issue occurs immediately after sending any chat message in a singleplayer world. It also occurs with Chat Heads installed and enabled (log).

Steps to Reproduce

1. Follow the steps shown in the screenshot.

2. Enter the world.
3. Send any chat message.
4. The client disconnects with a Network Protocol Error.

Expected Behavior (optional)

No response