My photos got deleted suddenly and not in recently deleted
Why my photos keep disappearing
iPhone 12 Pro, iOS 14
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If you had enabled iCloud Photos and then if you delete Photos and Videos from the iCloud it is deleted from iPhone Photos too, and vice-versa.
And if you happen to take a backup either over iTunes or iCloud after deleting Photos and Videos all the photos are deleted from the backup (iCloud/iTunes) too.