I have the same problem, a friend of mine too.
Rebooting and reinstalling Rock, logging out and in again into Qobuz didn’t make a difference.
Playlist was made using Roon.
Can’t play the songs outside the playlist either.
greetings oli
Edit.: After some fiddeling and checking if the songs are playable in the Qobuz webplayer (yes they are) I can now play the songs from outside of the playlist. But the playlist still seems broken with most songs marked as unavailable
another thing i just recognized is that if I play the song from outside the album it is not marked as unavailable anymore.
So i can recover the playlist by playing every song once from outside the playlist.