PNG images revive deleted images in the form of a thumbnail, potential risk

Saving a PNG image will revive deleted photos. To replicate this, save a PNG image, such as the ones on XKCD's "What If?", and deleted images get revived in the form of a thumbnail overlapping the image.
This has been here since IOS 5, according to http://appleinsider.com/articles/13/11/14/bug-resurrects-deleted-image-thumbnail s-in-ios-7-photos-app-dates-back-to-ios-5
Knowledge of this could be abused. If I get free acess to someone else's Ipad, I can just spam saving PNG images over and over to see their sensitive images saved as a thumbnail overlapping the PNG image's thumbnail.
How do I delete the thumbnails? It seems that when you delete a photo, it saves the thumbnail. This is supported by the PNG images reviving deleted photos in the form of thumbnails.

Send feedback/suggestions to Apple.
http://www.apple.com/feedback/ipad.html
Submitting Feedback to Apple
https://sites.google.com/site/appleclubfhs/support/advice-and-articles/submittin g-feedback-to-apple
File an Apple Bug Report, at http://bugreport.apple.com/
 Cheers, Tom

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