this is how i found it: i had a piston facing up, i put a redstone block on top. nothing. then, i put a block beside the base of the piston, and i put a redstone dust on top of that. the piston should extend. the you can break the redstone dust + the block it was on. the piston stays extended. this also works if you have 2 redstone blocks on top of the piston. then all you have to do is put a block (i used stone) beside the piston base and voila. the piston extends!
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a) Pistons can be powered from two blocks above.
b) If said block changes, piston wont be updated.
This is (at least temporary) intended behavior
Like following:
place piston, place 20 blocks in front of it, power piston — not extending. Break any block from second to 12th — still not extending. Place any block besides piston — extending
145th Duplicate of MC-108, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.