Forge version: 36.1.63
Twilight Forest version: twilightforest-1.16.5-4.0.515
Link to crash log: https://gist.github.com/chasiopen/4a89b1453b1ad0c379c40aaca839b9cc

Steps to reproduce:

1. Fight with YetiAlpha
2. YetiAlpha through the ice block
3. Boom!crash!

What I expected to happen:

What happened instead:

Caves and Cliffs mod is causing it, try without it and let me know

You are right.It works regularly without CACmod.
thx
But CAC is a excellent mod，ilove it.
Considering about some compatibility？

its not our fault its crashing, this is an issue on their end. I would talk to them about it because they obviously arent doing something right

i will report it to them too,thx