Describe the bug
Game crashes on startup when adding Sophisticated Backpacks
Crash log: https://gist.github.com/yuma-dev/612b21542aca9bdff62a23f6b8210327
Travelers Backpack does not seem to cause the issue

To Reproduce
Steps to reproduce the behavior:

1. Add newest Version to Forge(maybe with my mods?)
2. Start

Expected behavior
Game Starts

Versions
Sophisticated Backpacks 1.20.1 3.20.5.1039
Forge 1.20.1 47.2.17

this is definitely not sophisticated as it looks like some mod has modified vanilla code with mixin and sophisticated doesn't use any at all