When an item frame is placed on a block and that block it's on is destroyed, the Item frame takes an extended amount of time to fall off.
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duplicates 1
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Assumes I didn't search... well I always search for a similar bug but nothing appeared that was relevant to what I searched. So I say that it's just a bad search mechanic.

If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.

Searched for "Item frame block destroyed" and found nearly all the duplicates of MC-328 : https://mojang.atlassian.net/issues/?jql=text%20~%20%22item%20frame%20block%20destroyed%22
Duplicate of MC-328 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.