Quark version: 4.1-466
Zeta version: 1.1-33
Minecraft: 1.21.1
Neoforge: 21.1.211
Immersive Engineering: 12.4.2-194

Steps to reproduce: Have both IE and Quark installed at the same time, try to load a save or create a new one.

Log file:

https://mclo.gs/A1Uwx6a

Incidentally, dedicated server loads up fine.

Some investigation reveals that a likely culprit is the potion of stability, which seems to be slightly broken when looking at it in JEI.
Trying to find the recipe to craft a potion of stability gives no results, but on the other hand, trying to find recipes that use crab shells does