i couldn't get everything into the video without it being over 10 mb, but if you break the block adjacent to the piston it will power for a reason that i do not know and it will stay powered. with no signal, until a block update
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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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