There is an bug where a sticky piston glitches and doesn't pull the block back in as if it were to gunction just like an regular piston.. I don't know what's causing this issue so far. I've encountered it 3 times today.
BDS-17718
An sticky piston will act as if it were to be an regular piston
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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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