Describe the bug
Been getting this bug in my mod pack during terrain gen: other than that beautiful mod!

Crash Logs
https://paste.dimdev.org/toyowupacu.mccrash

USE https://pastebin.com/ FOR CRASH LOGS PLEASE

Looks like a client-sided issue with rendering chunks. This mod doesn't touch any of that stuff - could you check to make sure it's this mod?

Looking at the crash log I see that Animated Chunks is being used. I would suggest starting with that mod if you plan on trying to narrow down issues/conflicts. Just a suggestion.

If I remember correctly this was fixed - closing the issue.