The bug happens on minecraft 1.19.2.

I'm running forge 43.2.3 along with Optifine HD U I1 pre4 and Moonlight 2.1.22. I've tried running it the latest Moonlight version 2.1.24 and the bug still happens. I'm not sure if Optifine is responsible or if Moonlight is.

This issue is related to this one on the Optifine Github.
https://gist.github.com/webmilio/26bdbc33c40bef3f496acf90746e5aca

If the Gist is too short, I can reproduce the crash and upload the full log.

That's a create mixin

Wait you're right...