I have this issue and have been told by Russell in support that this affects playlist tracks beyond 250, that the ‘usual’ playlist limitation is 500 tracks and that normal ‘play from’ behaviour should be restored for playlists up to this length ‘soon’.
Have also asked for ‘mixed’ playlists to be achievable. Currently, you can make a playlist from Tidal or Qobuz or local storage but you cannot have a playlist which mixes tracks from these sources, even though you can make a play queue (by using the ‘play next’ or ‘play last’ function) with tracks from mixed sources (you cannot save this mixed play queue as a playlist)…