That’s such a scary bug.
I keep periodic (Daily backups) To account for such fear.
Glad you reported it and sorry for this loss. In the future, periodically export the world and safekeep it.
I have been experiencing the same issue. I just noticed all my paintings are gone in my base.
I couldn’t exactly pinpoint why but it seems when I leave the proximity of a painting it just falls.
Am glad this isn’t my world just being buggy.
This has not been solved. The issue still persists in my case and is pretty annoying, as am actively losing all paintings in my base.