I'm sort of late to this issue. I don't know if my experience is related to unreferenced playlists or not.

Using the 69.000...1 version, it moved several playlists around on me. Specifically, it moved playlists which were sub-playlists to the root level. I am not using soups.

Let me know if I can help in any way.

FWIW,

Jim

Oh, PS: what kind of dog is that. He's really cool looking!