In 1.16.3 if you power a downward-facing piston from 1 block above, and 1 block to the side (ie. diagonally) with a Redstone block, it fires the piston.
I'm not sure if this is intended behaviour, but if you then remove the power source, it does not un-power the piston. This is definitely not intended. 😛
Found by players on the LTT Network server - namely ExecutiveCactus
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Duplicate of MC-108
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This is called quasi-connectivity and has been around for ages now. Pretty sure some snapshot changes were even reverted to keep this behaviour intact so this might be intended behaviour as of right now.