Saw all the other people with the issues and saw the new mod in the latest version 1.5.3 for increased logging for watchdog crashes. Updated and still getting the crash, but hopefully with the increased logging you can find a solution. Crash report attached.
crash-2023-04-15_00.48.57-server.txt

Seems like it might be a chunkloaded hexal slipway spawning too many wisps based on the log. They've an open issue here: Talia-12/Hexal#47

Was able to fix my problem by killing all the wandering wisps before logging back in. If anyone else runs into the issue you can do kill @e[type=hexal:wisp/wandering] in the server. This issue can either be closed (as my issue is resolved) or left open for the pack to update Hexal when this gets fixed or find a way to prevent it.

This is now fixed in the next Hexal version, 0.2.14!