Pistons interact with redstone a signal even when interaction shouldn't be. Similar was and in 1.6 versions. It is a bug or and has to be?
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Duplicate of MC-108
Piston quasi-connectivity.

Doesn't duplicate a subject. There Bud switch. And here doesn't touch at all the piston.
Here the air block for some reason transmits a signal though the such shouldn't be.

Here the air block for some reason transmits a signal though the such shouldn't be
Indeed. Same issue, BUD or not. 😉