We are getting a bad server crash with the Enigmatica 6 modpack and using the crusher demon. Giving the demon an ore chunk from the Emendatus Enigmatica mod causes the crash.

MC 1.16.5
Forge 36.1.31
occultism-1.16.5-1.5.4
EmendatusEnigmatica-1.16.5-1.2.7

Crash report: https://pastebin.com/dX8LhfsB

I believe this is fixed already, in 1.5.5: https://github.com/klikli-dev/occultism/wiki/1.5.5

Yes this is a known issue that was already fixed. Please try updating the mod