Reproduction Steps

I was afk then the server crash

Crash Report File

File

You can put ai.nearby_entity_tracking=false into your Lithium Config file to work around this issue until it is fixed

I'll try it , but so far the server hasn't crashed again ( I haven't changed the config or remove any mods)

Do you have carpet's unloadedEntityFix enabled during the crash?

yes

carpet's unloadedEntityFix is probably redundant and now messes up the chunk entity lists. Comments at https://bugs.mojang.com/browse/MC-108469 say the bug is no longer reproducible in 1.16, so the "fix" now probably causes a problem.

Thanks for your help. If the server does not crash within a week, I will close this issue

Does the problem also occur when you are not using carpet and carpet extra?
(so far all users who experienced this problem were using those mods)

We're going to go ahead and close this issue as it looks like we're dealing with a problem in Carpet (see gnembon/fabric-carpet#443). The author has since pushed a commit to their own mod which removes the now irrelevant patch, so we think this problem should be solved.

If you experience this crash again, please leave a comment asking for the issue to be re-opened. Thanks!