I found that when attacking with Antitheus, droping the weapon during the attacking animation would crashes the game. Also any suddent way of losing it would cause the issue, which I think its the problem with the animation.

The crash report is attached, both EP and WoM latest Ver for Forge 1.20.1
crash-2024-02-12_00.55.23-server.txt
debug_EP_antitheus.log
latest_EP_antitheus.log