bug in 20w14 snapshot not listed as real version
a redstone torch placed above a piston doesn't cause piston to retract when unpowered
(doesn't matter if piston is facing down or horizontal)
(1 y-cord above)
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Snapshot 20w14~ is an April Fools update, and not tracked here.
Also, this is just another form of Quasi-Connectivity, and is intended functionality.