Apologies if this is not a bug, I don’t recall this happening prior to 1.7.
I’ve noticed that if you are in an artist view and locate a Tidal album and add it to your library the album stays in the Tidal section until you exit the artist and go back in again.
I would expect that the album would immediately disappear from the Tidal list once it has been added to your library. I don’t remember this happening previously?