Using Docm77's enderman farm design, sticky pistons can occasionally extend the block in front of them, however not retract it. I had heard that this bug had been fixed a while ago however, it is still present (Pressure plate leading to a red stone dust/repeater into a block with the piston on it)
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No, this is even when powered for more than 1 tick
Duplicate of MC-5726, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.