[1.21.11] World corruption with c2me + frozenlib

[pajicadvance]

Been testing a modpack and ran into errors causing world corruption multiple times. C2ME dev says it's likely this mod that's the culprit.

https://mclo.gs/VKJOfW6

[ishland]

For context, World.onBlockStateChanged is called on worldgen threads as well, and this needs to handle it properly:

worldthreader/src/main/java/no2/worldthreader/mixin/threading_compatibility/fixes/poi/ServerLevelMixin.java

Line 22 in f9a6a3e

private void useWorldThread(MinecraftServer instance, Runnable runnable, Operation<Void> original) {

[2No2Name]

@ishland Thank you for the additional context

[2No2Name]

Among several other issues, this should be solved by allowing non-world threads to acquire exclusive world access.