Songs Disappear from Playlist - New additions disappear, too
I have an existing iTunes playlist that now resides in the Music app. I recently noticed that half the songs have disappeared. When I try to add them to the playlist from the library, they disappear again. I subscribe to iTunes Match, so that isn't the issue. It's extremely frustrating to lose music playlists that I've had for years, and worse, be unable to rebuild them.
What's going on?
iMac 27″ 5K, macOS 12.3