Hi, I'm here to open up this issue because apparently, Blueprint seems to be a suspected mod involved in a java.lang.IllegalStateException crash error involving a biome from Quark.
crash-2024-07-04_20.50.45-server.txt

It was working fine, but after updating Waystone and and Create:TFMG, this happened.

Minecraft 1.20.1
Upgrade Aquatics 1.6.0.0
Blueprint 7.1.0
Waystones 14.1.4
Crashlog: https://mclo.gs/dnVspIY

I have the same crash. I am not using Create:TFMG but I did update Waystones just today. My crashlog seems to involve Terralith's Mantle Caves if I'm reading it right.

Minecraft freezes and the console generates a crashlog but then doesn't close Minecraft.

Not a Blueprint issue. See #197 (comment) for explanation.
Duplicate of #197.