OptimizationsAndTweaks

seem to fix these bugs :

Thread safe issues with entityLists can cause crash , know to make crash instant with Cocoutil

Mobs can spawn into blocks (NOT PROPERLY FIXED)

Fire can break blocks really fast

cascading worldgens caused by populateChunk from MixinChunk

crash caused by MixinPatchSpawnerAnimals

There is an attempt to load a chunk (-42,64) in dimension 0 that is already being loaded. This will cause weird chunk breakages.

Server attempted to spawn an unknown entity using ID: {0} at ({1}, {2}, {3}) Skipping!

NPE caused by optimizationsAndTweaks$isTargetEntityValid

Crash Don't know how to add class tumbleweed.common.EntityTumbleweed! (NOT PROPERLY FIXED)