With the Defense skill "Counter Attack" active, every entity that touches the player causes a ticking entity error.

Quite a few instances of it happening in this log. Disabling that skill causes the issue to stop.

https://gist.github.com/c0gd1s/463bc681702123229ee79ad93a26b80d

Yes, crashes the server as well.

Yes, crashes the server as well.

If you add Neruina Ticking Entity Fixer it will stop your server from crashing. Only temporary fix I found is to disable the skill, the rest of the mod works fine.

https://www.curseforge.com/minecraft/mc-mods/neruina

With Neruina, I had to set the threshold in the config to 1000.