This is a VERY technical bug that has been an ongoing issue in my in-development modpack. [Possibly years]

Basically while loading chunks in the world sometimes, the game will stop loading chunks altogether, and the internal server will hang - which forces people to crash to desktop.

This behavior is most notable in "Skyblock" and Superflat Worlds, but also occurs in normal worlds on rare occasions.

This is a thread dump of my hung Minecraft Instance:
mc_threaddump4.txt

The problem thread can be found at "Server thread" #763 prio=5 os_prio=0 tid=0x000000007b0a0000 nid=0x3b300 runnable [0x000000004cc8d000]

Hopefully this can be fixed somehow.

[This problem does not produce a proper crash report.]

Precisely, the hang occurs here: https://github.com/gottsch/gottsch-minecraft-GottschCore/blob/1.12.2-master/src/main/java/com/someguyssoftware/gottschcore/world/gen/structure/DecayProcessor.java#L114-L115
Maybe replace the while loop with a for loop and a limited number of tries?

I am pretty excited to possibly see an update on this particular crash.

This should be fixed in v1.15.1

Thank you for addressing this, and for your time.