Hi can you share your modlist ? I believe this crash is related to this topic aswell: https://forums.minecraftforge.net/topic/160322-server-keeps-crashing-on-startup-and-idk-what-to-do-anymore/?do=findComment&comment=588397
hello im facing this exact issue where mods that used to work on dedicated servers fail, all attempting to load the class "net/minecraft/client/multiplayer/ClientLevel". The mods which had this error were cold sweat, create, legendary onsters, iron spells, and bosses'rise, similar to your set of mods. perhaps its a 1.20.1 forge bug?
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