Figure I open up an issue here just in case.

Refer'd:
Flemmli97/ImprovedMobs#104

Minecraft: 1.12.2
Forge: 14.23.5.2854

Mods: 4
ImprovedMobs-1.12.2-1.6.10
jei_1.12.2-4.16.1.302
TenshiLib-1.12.2-1.2.4
TheBetweenlands-3.8.0-universal

Crash 1: Swarm
crash-2021-10-28_12.17.56-server.txt

Crash 2: Stalker
crash-2021-10-28_12.15.43-server.txt

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Improved Mobs is a mod that makes some changes to them, such as having them wear armor, have enchantments, etc. Now... for some reason if the Swarm or Stalker mobs appear... the game will crash and will forever crash in an endless loop.

This doesn't occur if ImprovedMobs isn't installed. Also I am unsure if there are other mobs affected by this.

Just wondering if there's any update with the crashing issue with ImprovedMobs.