Bug Description

Hi,
today after updating some mods for the BMC4 Modpack the game crashed, or rather failed to load starting from an error that spoke of an issue with "Dupplicate Mods" discovered with the xenon-0.3.31+mc1.20.1.jar
i have no idea if that was an error within the mod or that came about with an error while updating or maybe it was caused in combination with the essential mod.
anyway i could start the game after disabling Xenon. was wondering if someone could tell me more about wat went wrong here.

Reproduction Steps

just have the BMC4 moddpack fully updated and work in the essential mod, then try starting the game.
again im not sure where the issue originated

Log File

main.log