Create a flat world
Place a sticky piston block facing up at y -63 coords.
Place a block 2 blocks above.
Activate the sticky piston and deactivate it
As you can see in my attachment, a sticky piston doesn't pull the block if it's placed on y -63 coords.
Thank you for your report!
We're tracking this issue in MCPE-96088, so this ticket is being resolved and linked as a duplicate.
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