While trying to make a redstone contraption today I found a bug in Version 1.17.1 where if a redstone block is place one block away from a piston it will still be powered. It only works when it's made vertically and the redstone block is above the piston that is facing down. This is causing some crazy issues with redstone contraptions. How can a piston be powered through a redstone block with air between them?1
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Duplicate of MC-108, which was later resolved as "Works As Intended".

@Avoma
How can a piston be powered if there is air between them? how?

Try reading MC-108 or this article on quasi-connectivity. MC-108 is struck because its resolved.