I was doing some experimentation with the sticky pistons and redstone blocks. I noticed that you can make sticky pistons push a redstone block, and pull it back, when it's facing the sides and the bottom, but it won't do the same for the top. It gets stuck after turning off the power source that's pushing the piston.
When I remove the redstone block, the piston then retracts back. Hope I explained the issue well enough!
EDIT: I will post pictures if issue needs to be explained more.
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Redstone blocks emit power, and if they can be powered from above, then the redstone block is powering the piston. I'd say it works as intended.
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132nd 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.
Pistons can be powered frop two blocks above:
https://twitter.com/Dinnerbone/status/313237462757543937