TRANSFORMER/[email protected]/com.github.alexthe666.alexsmobs.event.ServerEvents.onLivingUpdateEvent(ServerEvents.java:718)

thats all i was able to find i use the mods on other 1.20.1 worlds with no problems

im having same issue, i looked at my log and it saying there's too much ticking from alex mobs

I have the same issue. The problem is with alex's mobs interaction mod if you have it. I disabled it and its working. The guy behind alex's mobs interaction is preparing a fix.