Hi team!

This is very likely a mod incompatibility issue in the pack I'm developing. I raise it to you as it was the addition of this expansion, the discovery of a biome, and the subsequent crash report including your name in it.

From what I can tell on the surface, it's a WorldEntitySpawner mixin clash(?). I'll do some more digging myself to see if I can identify the cause, but Java is not my strongest of languages.

This is the mod pack: https://www.curseforge.com/minecraft/modpacks/dragonheart-cpe
Crash report: crash-report.txt

My mistake! I've found the issue to be a config parsing problem with the Greek Fantasy mod. I've opened a PR and resolved the crash with a build.