We put redstone block onto the piston.
Give Power.
Power off.
And piston to return to the table.
Heeeeey Please listen to me. That such a thing is absurd. This is a bug. Please Fix it.
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[media][media]

Duplicate of MC-108

WAI, this is called Quasi-connectivity. There is a wonderful page on it here: minecraft.gamepedia.com/Tutorials/Quasi-connectivity