If you put an item frame on the wall, then put another item frame in the item frame, when you break the first item frame you only get 1 item frame back.
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Duplicate of: [MC-1285] - Please use the search function to see if your bug has already been submitted. Currently 25% of tickets are being closed as duplicate
This has been said before. When you destroy the item frame in survival, you get them both back, but they are stacked. It appears as if there is only one drop, but it puts two in your inventory.