Neoforge 21.1.72
ars_nouveau-1.21.1-5.2.1-all
ars_elemental-1.21.0-0.7.0.7
ars_additions-1.21.1-21.1.1
game some time say "failed to save chunk, see logs for details"

in log says: https://gist.github.com/CubeTwo/e7f2b88b41ed66037e7a23d83601b6e9
full log:
latest.log
in log it says generating crash report but i cant find it.

It is failing to save a mob that was in a jar. Do you know which mob it was?

at 59,49 i cant find any jars or dungeons with jars, but in world i have dungeons from ars_additions and in that what i found have : creeper jars, pufferfish jar, Ghast jar, Elder Guardian jar, and 1 empty jar, was found.

Hi, Ive ran into the same issue on 1.21 running with ATM10 Ars version 5.4.1 , I investigated the chunk the error logged, it only contained 2 jars one with an Elder Guardian and one with a Pufferfish, it seems to be a part of a structure generated by Ars Additions

Fixed in next version