Paintings deep disappearing

Some paintings keep disappearing after a while from my Minecraft world in the same places since Minecraft shut down suddenly. Creative alone. Everything is up to date

I've repaired, reset, and reinstalled everything
No previous backups
Stable internet
Adjusted settings
No add-ons
level.dat and level.dat.old replaced

Paintings should stay on the wall but still keep disappearing after a few hours ou reloading world…