1.open up a container in a way, so that you can still see your item frame.
2.hover over an item -> the map flashes slightly
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[media][media]
This appears to duplicate MC-1415.
Duplicate of MC-605 , please use the search function to see if your bug has already been submitted. Currently over 30% of tickets are being closed as duplicate.
tails, i did search the already posted issues, but sadly most of them are labeled badly, thus you can not find them.