Turning On and Off Explicit Music Deleted My Music From Playlists

I was recently experimenting with the restrictions ability to turn on and off explicit music and added clean (music that was available whilst explicit music was turned off) to my playlists containing explicit music. When I had disabled the "clean only" feature, my playlists originally containing explicit music (these playlists has a mixture of both clean and explicit) had deleted all explicit music they contained. All playlists that I didn't amend while the clean feature was on were okay, and all songs were unhidden with no issues. I'm just confused as to why this happened. I understand that adding available music to a playlist with explicit songs would slightly toy with the order of the playlists' songs. To my knowledge, however, the explicit music should be hidden--not deleted. Why wasn't the "clean" music just added on after/below the explicit music that was hidden at the time? This is a very odd design and seems honestly like a bug. I couldn't find another case of this on Apple's forums, so I assume it's a rare bug--however, it's still a bug alas. Any support someone could lend me?