The piston is activated by the redstone torch, which is not expected to happen.
I think the behavior of the redstone lamp is correct.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-108, which has been marked as Works as Intended - this is an intentional game feature. If you have a different opinion, please visit the Feedback website.
Please use the search function in the future to prevent duplicate reports.
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