I can confirm this bug, too, because it happened with my wife.
I have a world that I've been doing various tests in, among them being texture pack tests.
So, I stuck a bunch of item frames on a wall and stuck in the items that I'm altering the textures of.
A few days later, my wife is exploring, and comes across a wall of floating item frames, containing the items I was mucking around with. (Stone and iron tools, some fish, a bow and an arrow, a few potions...)
So, yeah, this is a thing.