This works in this way back to iOS 9 or even iOS 8.4 days I remember. So definitely not new here. Maybe considered as a bug tho.Just looked, and have a recurring bug from Beta 6 that has survived resets and restarts:
In the Music app, creating a new playlist has issues. When manually selecting each song to initially add as part of a batch, you cannot deselect a song once you tap it. Also, you can add the same song an unlimited number of times by tapping it repeatedly (the overall song count reflects this). Pretty odd one there.