1) A redstone signal traveling two blocks above a piston powers the piston. When the signal is destroyed, the piston must be updated manually.
2) A redstone signal traveling into or past the air-block above the air-block directly above a piston powers the piston. When the signal is destroyed, the piston must be updated manually.
Please do not mark unreleased versions as affected.
You don't have access to them yet.
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