There is a bug In the current release where if you were to destroy a item frame with any sort of item in there, (in my case finding out the bug an op sword) It will destroy it. The steps to do so is.

1. Get an item frame with any sort of item and place the item frame down 
2. place the item down 
3. but quickly destroy the item as soon as its placed then by clicking both mouse keys with the right mouse key being first
4. It will give the item frame back but not the item 

(Please note that this is quite a quick action so the first few tries may be unsuccessful, and by finding this bug I have yet to try the snapshots)