Daily Mix: Removed songs come back after saving other songs

[a11yson]

Hi! I'm having an issue with my daily mix on my Mac (10.11.6):

Steps to reproduce:

1) In daily mix, click the "Remove" button and "Don't play this song" to remove a song.

2) Notice that the song no longer appears in the daily mix playlist.

3) Click the "+" button for another song in the daily mix playlist to add it to your library.

4) Notice that the song you removed in Step 1 is now back in the daily mix playlist.

Maybe this is a bug, maybe it's just my machine, maybe I'm misunderstanding how the "don't play this song" functionality should work, but I thought it was worth reporting. 🙂