iTunes to Music export/import resulted in empty playlists
I exported .xml library from old Mac iTunes and imported into Music on new Mac.
Playlists all showed up, but they are all empty.
In fact, a few I opened to check were actually emptying themselves of tracks.
Others have a few tracks in them, but are completely wrong.
How can I get my playlists back in full and in tact?
Mac mini, macOS 10.12