Pistons do not update properly when powered from above by redstone dust in some cases. It seems that if a piston is powered from above by a redstone line (redstone on top of a solid block on top of a piston) it has a chance (locational) it will not retract after being de-powered. Using a comparator, a 1-redstone-tick pulse, or a redstone power level of 15 seems to resolve the issue. See the coordinates and redstone layout in the video to reproduce the issue.
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violine1101
Thank you for your report!
We're tracking this issue in MC-108, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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