I'm not sure about the other armors but I get instant CTD when I wear the dark Maximillian armor set from epic knights.

Game Version: 1.20.1
Mod version: ismah-forge-1.1.0-1.20.jar
forge version : 1.20.1 - 47.4.0

Crash file :

crash-2025-07-22_13.27.42-client.txt

A new version has just been released that should not crash.