What version are you seeing the problem on?

1.18.2

Describe the issue

1. start up a server
2. wait til it loads
3. then the server will suddenly crash

latest.log

https://gist.github.com/BugmanBugman/981a8f195116ded9685cc25d3388a55b

Hi, this may not be the exact same issue but I'm getting this screen:
"Errors in currently selected datapacks prevented the world from loading." And referred to return to title or use safe mode.

I've narrowed it down to a compatibility issue with Placebo 6.4.0 and Pollen 1.4.3, as these are the only two mods I have installed, and I'm still getting the error.

Edit for clarity: this is when attempting to start up an already created world, or to create a new world, both single-player.

Yes, that's the same problem i'm having. Thank you for narrowing it down! I hope it's fixed soon.

i'm having the same problem as well. I couldn't recreate it with only pollen installed, but removing it from my modlist made everything work fine. It might be a compatability issue

Duplicate issue, this has been fixed and will be released this weekend