[mrbuttons454]

I've seen this on photos sent via iMessage, even before this update. I have the feature enabled where photos sent to you from certain contacts automatically show in your photo library. Some photos... do not need to remain. I can delete them, but they return.

May be related, may not be. I do wish iOS had a better "hidden photos" concept.

[navanchauhan]

The Photos app does have a special hidden album now, and requires biometrics to unlock (or your password).

You can also ask the app to not showcase certain people or photos in features photos / widgets.