When a redstone block is placed one block above a piston, it extends and stays extended when updated. This happens with both sticky pistons and regular pistons. It does not occur when the redstone block is placed beside or below the piston; only when it is above.
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pokechu22
Thank you for your report!
However, this issue is a Duplicate of MC-108.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
This behavior is called quasiconnectivity. Please read this article for more information.
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It could be a powerful redstone block