What happened?

when getting a slow falling or any other potion from trial spawners in the end castle and opening your inventory the game crashes
Edit: slow falling potion was actually a levitation potion but its so broken that it just crashes

BetterEnd

21.0.11

BCLib

21.0.13

Fabric API

0.107.0

Fabric Loader

0.16.7

Minecraft

1.21.1

Relevant log output

https://pastebin.com/u23PT2R8
too long for github (sorry)

ok so Im realizing its a different mod that adds the end castle and somehow conflicts with better end somehow