Add “sometimes songs are replaced by versions from compilation albums” which is also incredibly frustrating if you like to curate a library. However, all of these bugs have been present since iTunes Match launched, long before Apple Music was a thing. I have no faith they’ll ever get fixed.
My theory is that rights for songs temporarily lapse or transfer, causing the album to be removed and re-added on the back end, and the system to match things back up is wonky.
Syncing music to the Apple Watch is also incredibly unreliable. I had to deduce that songs that aren’t downloaded to the phone will never transfer to the Watch (even though the Watch has its own WiFi connection) because the transfer screen just says “syncing...” forever.
Apple Music is horrible, but the lack of a real library in Spotify (as mentioned in the article) is just about keeping me subscribed.
I also enjoy the "play random song when plug into car" feature :)
I am not sure but I think it's related to another longstanding issue where a particular version of a song is replaced with a different version of a song (usually one from a compilation or best-of album instead of the original single or EP, etc.)
1. The original app that was playing (Podcasts, Spotify, etc.) got automatically killed for whatever reason (consuming too much memory, etc.)
2. The default app for audio playback is Apple Music, so if you press play (or if your car resumes audio), that is the app that starts up.
There is no way (at least right now), to change the default app for audio playback on the phone.
I don't know where that option is, or maybe it's gone with iOS 13. It was annoying.