Not sure how to trigger it really. I just found a video on youtube of a man making the glitch happen. Here is the link if you need it. http://www.youtube.com/watch?v=lFy8XGVPa9s
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duplicates
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migrated
MC-12030
A glitch that occurred with redstone blocks and pistons to duplicate a diamond block.
Resolved
Duplicate
0
migrated
migrated
(Unassigned)
Unconfirmed
Minecraft 1.5
Retrieved
Duplicate of MC-631, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.