Same thing is happening from recent update (may be)…I’ve created playlists by adding thousands of songs into each….this addition into library..where the whole album is getting added when I add one song is annoying as it occupies space of my fone….can apple do something here to fix….though u disable the toggle …it automatically enables on adding music to playlist. I’m planning to switch over YouTube music as it doesn’t add space to fone on creating playlists with thousands of songs in each. Moreover YouTube plays almost all songs in one volume level unlike Apple music which varies from one song to another!