Looks like an issue related to mixins to have fun, the game didn't even show me the java screen and the log is screaming about mixin errors lol.
latest.log

Version 1.12.2-1.2.1.1

The error is useless however, it does not really tell me what the exact issue is as the stacktrace (error) points out something that is not there in the code

Interesting, this happens even with just the two mods in...

This is a 1.12.2 error, 1.15 and 1.16 don't seem to have this issue, but I can tell this is caused by my mod. I'll mark it as a bug/crash

面白い！

If you need more info let me know

Ohh, what happens if you remove MixinTweaker?

Uh mixintweaker? I don't think I have that installed unless another mod autoinstalled it.

Oh wait nvm I mixed up MixinBootstrap with MixinTweaker, remove MixinBootstrap if you have it :p

Unless you're talking about another mod that also uses mixins, in which case yea I have a few (vanilla fix and bewitchment right off the top of my head and probably several others)

Where would I find it?

In the mods folder, under the name of MixinBootstrap

Yea that isn't in the mods folder

I also removed the other folders that could've potentially had it inside.

the issue still occurred so I'm not sure

https://paste.ubuntu.com/p/545wt2YmCF/
Can confirm this. Crash occurs with and without MixinBootstrap, no difference concerning the log.
Playing 1.12.2 with BetterHurtTimer-1.12.2-1.2.1.1.