Spotify tried something again.

Suddenly my shuffle was Smart Shuffle (TM) and injected songs not in my playlist, into my playlist playback queue.

They really want me to stop paying them.

@lawik Their most recent UI overhaul made it borderline unusable for editing my playlists. I can't really deal with migrating right now, but I'm seriously considering it in the near future.
I saw someone post this recently, might simplify the transition a lot: https://soundiiz.com/
Soundiiz - Transfer playlists and favorites between streaming services

Convert playlists and favorites between different music platforms. Import your playlists and favorites from Apple Music to Spotify, TIDAL, YouTube Music, Deezer and many more!

Soundiiz