When you make a circuit with the redstone block on a piston facing up, activating the piston with push the block up than will remain up even with no power.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-108, which has been marked as Works as Intended - this is an intentional game feature. If you have a different opinion, please visit the Feedback website.
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