it seems that this bug has reappeared, despite the status of "resolved"
How you can see in video, that bug appears when you side your pistons up, place redstone block and activate it.
Somehow redstone block activate extended pistons.
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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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