Potato disappeared from item frame

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!