Minecraft Version
1.21.1
Immersive Engineering Version
12.4.2-194
How did it happen?
The powered lantern's spawn cancelling effect causes the game to crash if you infect a villager within range.
Tested with only IE, and within a modpack, same result and similar crash log output.
Crash Log
https://gist.github.com/alexstratford/8401fa362d1ab09044e47313e8097292