Sticky piston stays extended with no power source - placed a redstone block diagonally up and left then destroyed redstone block. Piston stays extended. Sticky pistons only. All gamemodes. Vanilla. All versions of 1.8. I'm using 1.8.9.
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This is called BUD(Block Update Detector), and it is a official feature. Work as intended.

BUDs are not an official feature, but this is a dupe of MC-108.

Really? Aren't they a feature? (Well I guess it was a bug first, and then changed...?)