The Oreganized mod is used on our 1.20.1 modded server. I crafted the Electrum Sword and max enchanted it. When I hit another player on the server and the kinetic mechanic wasn't used the it would be fine, but when it was used the player wielding the swords game would crash. I tested this with another friend on the server, letting him use the sword and the same results occurred. I also tested the sword out on mobs which did not crash the game. So I believe this is a bug in the mod for multiplayer that only affects PVP. Thanks for looking into the issue.

Crash Log:

crash log.txt