I've assembled a 3x3 sticky piston door (Not spiral, simply retracting) and when ever I open it, the piston at the 9 o'clock position doesn't retract unless I update the block attached to it (such as breaking the block). I've got it in both my creative and survival worlds and the test door in Creative worked fine until I built it in survival, now both have the same problem.
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Duplicate of MC-108, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate. The block up and to the right of that piston is powered by the redstone dust on top of it, so when the torch under the piston turns off, it still has power and doesn't retract. When that block is unpowered a tick later (the repeater has delay) the piston is no longer getting power, but it doesn't update because of the quasiconnectivity glitch.

Thank you. Just as a question--if I replace the block with a slab, will that allow the piston to retract?

It should.

Thanks.

No problem.