I had this recently too - i wanted to demolish the house my sims were living in to build them a new one so put their crafted items into inventory so they weren't lost.
When i brought them out of inventory, some of the Masterpiece paintings were no longer MPs (but not all of them).
Worse still, one of the paintings had reverted to an unfinished state (& the artist sim who had painted it was dead, so it couldn't be re-done).
With all packs, patched current but I can't recall if this happened after the hotfix or before it... possibly after
@crinrict No, none of them were copies & they definitely didn't leave the lot. Just a house demolition
It was a mix of family & personal inventory too.
