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If you can see the screenshot, then you will see that the bottom piston is extended even though nothing is powering it. Why does this happen?
If you follow your heart, it will only lead to your arteries.
What you're seeing is an example of quasi-connectivity; the upper redstone block is powering the space above the lower piston.
This is a long standing feature that has been officially stated to "work as intended".
It can be both quite useful and quite annoying (mainly depending on whether the quasi-connectivity was planned).
q.v. Quasi-connectivity
If you can see the screenshot, then you will see that the bottom piston is extended even though nothing is powering it. Why does this happen?
If you follow your heart, it will only lead to your arteries.
What you're seeing is an example of quasi-connectivity; the upper redstone block is powering the space above the lower piston.
This is a long standing feature that has been officially stated to "work as intended".
It can be both quite useful and quite annoying (mainly depending on whether the quasi-connectivity was planned).
q.v. Quasi-connectivity