This bugs seems to occur when 2 pistons are un-powered at the same time, and is probably related to the new way in which pistons update. I have 2 example set ups in the images - a vertical and a horizontal one. In both you can see that when the piston extenders become deactivated the block which was pushed by the pistons is left alone.
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Duplicate of MC-9342, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
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My apologies, my quick search wasn't quite adequate it seems. Thanks