The piston isn't being powered and it is pushing. No block around it, including diagonal, and it's just these pistons.
Updated version of https://bugs.mojang.com/browse/MC-120182. <-- I only use OptiFine for smoother framerate, but I disabled it this time
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violine1101
Thank you for your report!
However, this issue is a Duplicate of MC-108.
It will be linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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It isn't much related, there is no power source at all within 3 blocks of that piston