I was messing around with redstone and I placed a piston next to a power source. I removed the power source, and all blocks around the piston, and it still is powered. I relogged, and the piston is still powered. Every time I break and replace the piston it is still powered.
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Is there any other redstone around the block, maybe on top of the smooth stone or somewhere else?

@Galaxy_2Alex If you look in the picture, there is no possibility for quasi-connectivity. I made sure that no red stone was powered or even near the piston.

Please provide a screenshot while pointing at the piston with your F3 debug screen enabled.

@Galaxy_2Alex It's the next day, and I replaced the piston in the exact place and it was still powered. After, I tore out all of the redstone surrounding it and it was still powered. Then I updated the piston, and it retracted. Thus it was BUD powered somehow. Still, it should not have been powered as there were no blocks in a 3x3 radius around the piston.
EDIT: I replaced a redstone line that was above the piston. The piston then repowered. This is certainly a bug, as there should be no quasi-connectivity between these blocks, as there is a full gap of air between the block and the piston.
I tested with multiple pistons in two different worlds and the bug is repeatable.
I then tested it in 1.15.2 and still happens. There's no way this is intended, right? It doesn't make any sense based on the rules of the game. Diagonal power exists, but this is something entirely different.
It also happens in 1.12.2, which means it must be intentional.
EDIT: I conferred with a redstone discord, and it turns out to be intentional Quasi-connectivity. Thank you.

Thank you for your report!
We're tracking this issue as 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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