Put the summary of the bug you're having here
What happen was...:
i put a potato in a item frame i go to my bed room and win i get back it was gone!!
What actually happened was...:
i put a potato in a item frame i go to my bed room and win i get back it was gone!!
Steps to Reproduce:
1.kill a zombi and get potato
2. Put a potato in a item frame on a wall of iron ore in custom world tipe
3. go away for 2-3min! win you get back the potato will be gone...
FOREVER!!!!!!!!!!
you do need winrar for the world save i compressed it w/ winrar!
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What I expected to happen was...:
i put a potato in a item frame i go to my bed room and win i get back it was gone!!

Does the potato reappear after you log back in, and are there any items lying about on the ground? (if cheats are enabled type /testfor @e[type=Item] and see if anything pops up)

The entity UUID provided a invalid format. is what poped up!!!!!!

So that means no item was found (due to a bug MC-73529)

(sorry for late response)
Just opened up your world today and there was a potato in the item frame (attached screenshot). This is most likely a duplicate of MC-65040.