In certain areas (I am unsure as to whether it is specific to some chunks or specific to certain XYZ values), pistons that were powered by powering a Redstone line on top of the block above the piston remain powered once that Redstone line is unpowered. It appears to happen in all directions, and makes some Redstone difficult. Pistons appear to sometimes unpower after a long period of time.
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Could this be related to quasi-connectivity, aka BUD powering?

There are no power sources nearby to be BUD powering it, so seems unlikely from my Redstone knowledge, however, if this is an intended function of Redstone then I shall flip the report to the areas of the world in which this doesn't happen.
Thank you for your report!
We're tracking this issue in MC-108, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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