Mod Name

BCLib series

Mod Homepage

https://modrinth.com/mod/bclib

Minecraft version

1.21.1

Describe the bug

Anytime the game runs a (neo)forge mod runs into varient expectation error

Steps to reproduce

1. Install connector (1.21.1 latest versions)
2. install BClib & world viewer .13 version
3. install a (neo) forge mod (can be: aether, framed blocks, simple clouds, biomes o' plenty, biomes we've gone)
4. run the game (PRISM LAUNCHER)
   ...

Logs

https://gist.github.com/Galaxy2K99/b6e6c34cde4b11c4467e1d0a4b341945

Additional context

Better End .11 crashes and 0.9 doesn't