MC 1.16.5, mods per https://www.curseforge.com/minecraft/modpacks/hexworks/relations/dependencies & versions & changelogs per the google sheet in the docs.

Minecolonies residents exhibit occasionally strange behavior normally, typically consisting of not operating on some buildings or 'forgetting' chunks of a building, e.g. missing some blocks on a roof or claiming an unfinished structure is complete. Such structures do not seem to be repairable by the citizens themselves; builders simply stand idly by instead of moving to repair the structure, though the materials needed for the repair are still correctly deduced.

Very rarely, this seems to cause a crash with a spectacular log (several affixed alongside debug logs and crash reports).
2021-11-19-3.log.gz
2021-11-19-4.log.gz
2021-11-20-1.log.gz
crash-2021-11-19_06.24.27-server.txt
crash-2021-11-19_06.25.27-server.txt
crash-2021-11-19_06.28.35-server.txt
crash-2021-11-19_19.38.33-server.txt
crash-2021-11-20_01.37.05-server.txt
debug-1.log.gz
debug-2.log.gz
debug-3.log.gz
debug-4.log.gz
2021-11-19-2.log.gz

2021-11-19-1.log.gz