As shown in photo. The pistons are unpowered. I checked underneath and it's not powered either. The pistons do not retract until I manually give them a block update.
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I experienced the same issue, but on a larger scale. All redstone contraptions were not working after being activated once. On said day, I reuploaded world and this fixed the issue.
Thank you for your report!
We're actually already tracking this issue in MC-108, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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