Every time I enter my world all paintings I have on the walls fall off. None of the paintings have anything in front of them. One has a false wall behind it(using signs to keep on wall). I believe this has been an issue in the past.
Environment
Windows 10, Java edition
What version are you playing on?
I see that you have mentioned 1.15.2, but this is supposed to be fixed on that version. Also, are you using any mods or datapacks?