When I Make An System To Use The New Implemented Funcion, The Item Frame Item Detector, When I Place An Piston To Break The Item, And Active It, The Redstone Goes To An Infinity Loop!!! Some Screenshots:
1'st :
http://imgur.com/cJp5FTU
I Have Made The Simple System, And Not Activated It.
2 :
http://imgur.com/yNdZHZx
Here I Have Activated The System, The Piston Brokes The Item-Frame And It's Continue Sending Redstone Signal.
3 :
http://imgur.com/iel1NXe
And Here I Have Broke The Piston, And It's Continue Sending Redstone Signal.
Steps to reproduce:
*Put an item frame at a block
*Put a comparator output to the block
*Put some item in the item frame
*Destroy the item frame by piston
--> Comparator output does not change until a new item is placed in a new item frame
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Confirmed for 14w34b

Confirmed for 1.8.3
The enviroment is supposed to contain pc details.
Confirmed for 1.9.3 pre-3
Confirmed for 1.9.4
Confirmed for 16w20a
Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.
This is an automated comment on any open or reopened issue with out-of-date affected versions.
Merged into MC-120986.
Confirmed, see screenshots.