I was about to build a contraption to "mark" full chests with a lit redstone lamp, when I encountered this:
If you put any piston facing upwards, put a redstone block on it and extend the piston with a lever or button (or any otehr edstone signal), the piston will not retract anymore.
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Tried to look for it, but "redstoneblock" didn't yield any compareable results.
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Pasting "redstoneblock" into quick search gives me 9 results, 8 of which exactly describe what you are reporting here.
160th Duplicate of MC-108, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.