If you’re using Apple Music as opposed to maintaining your own library, then yes, I had this with B2 as well.
When I finally got peeved off with it, I quit Music, made a backup of the Music folder, deleted the original folder and rebooted.
When the Mac restarted, I just started up the Music app again and everything was back to normal.
I doubt this will work if you maintain your own library of files though.