Even with no surrounding blocks and no possible way to be powered when ever a piston is placed into two different adjacent locations it extends. Picking up and replacing the piston does not change results and the piston extends again.
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This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded MineCraft.