tj072
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Comments
I've had the same issue. Paintings outright disappear. They do not simply break and leave behind the item. They vanish. Single player world on PC.
I've had the same issue multiple times. I believe this is the same bug that causes other entities (paintings, animals etc) to disappear: MCPE-21416
Mojang stated "We believe that random entity loss was fixed for most players in the 1.18.30 update by changes to how entities are stored in the world databse."
However, I've had Villagers, Paintings and Animals still disappearing in 1.20+. It might be related to going to other dimensions as you suggest, though I can't be sure. I'll need to do some more experiments.