When pistons are facing up and at Y=254, they will not extend until an immovable block that is broken by pistons is placed on it.
Steps to reproduce:
1. Place a piston at Y=254.
2. Place a block next to the piston.
3. Place a lever on the block.
4 . Activate the lever.
Expected results: The piston will extend normally.
Actual results: The piston will not extend until an immovable block (buttons, levers, redstone dust etc.) that a piston can break is placed on it.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Hi there, a possible theory may be that since the height limit at 256, and considering that extended pistons take up two blocks, game mechanics may somehow refuse to allow the piston to extend up to 256. I'm not an experienced coder, but that is my best explanation. The bit where you said blocks that pistons can break allow the pistons to extend may be caused by some sophisticated mechanics.