Some Playlists from Mac Music not showing up or if then songs are missing

How is this supposed to work? I know I can press cmd-R to reload. But nothing changes. I have about 20 playlists in music but only 10 are shown in djay pro. I created a new playlist. That was showing up. Then all of a sudden it disappeared. Then I put a song into a playlist that is actually shown and reload in djay. But the song is not showing up.
What’s happening???