I built a mechanism, but if turn off the torch on top, the piston remains active.
After that you can just break mechanism, don't touching the piston.
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This is a special redstone mechanic called quasiconnectivity. It IS in fact a bug, but so many people started using this bug to make advanced redstone contraptions, that they decided not to fix it because it would break so many redstone contraptions.
Dupe of MC-108