I've got a server running 9-0.2.46 that is crashing when a player is in the Other dimension dungeon area. I'll try updating the server to the latest version, but from what I've read in the below its because of a mob spawning? I'm not sure I'm not an expert at reading the crash logs.

Below is the crash log:
https://pastebin.com/18U8yzvZ

I get a similar crash when being hurt by a Wither Skeleton, even one naturally spawned from the Nether or from a dungeon in the Overworld. Can you please attach screenshots or NBT dumps of the tools and armor you had at the time of crash?
crash-2024-02-19_15.56.50-server.txt

IDK If adding my comments helps, but the same is happening on our server. Version 0.2.43

Currently next to a wither skeleton spawner in one of the hallways. It has crashed 3 times in this area. Requiring editing forge config to delete ticking entities, restarting, loading in, shutting down and turning the setting back to false.

I had just fixed it, walked down the hall for the next set of spawners and chests and it crashed again. I'll now ask folks to avoid the area.

https://pastebin.com/2jcngQ2q

IIRC it's always involved Wither Skeletons, at least the last 3.

Couldn't easily find how to NBT dump, but here are screenshots of what I had on.

Miscellaneous artifacts. If an NBT dump is better and you can tell me how I can give it a try.

For an NBT dump, try running data get entity @s, then post the resulting output from the logs.
If the NBT data is too large to post, run recipe take @s * then try again.

Ok, here are the results of that command. after recipe take @s *. Otherwise the log more than quadrupled pastebin's max size.

https://pastebin.com/LGjvPTDB

Same issue for me, wither skeleton is ticking and crashing the server upon joining. Gonna try switching to peaceful to despawn it

Caused by thorns killing skeleton-based mobs, see #1153