piston works even if no redstone is around

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This is intended and is known as quasi connectivity

Yup, it is quasi connectivity, which is intended per MC-108.

Thank you for your report!
We're tracking this issue in MC-108, so this ticket is being resolved and linked as a duplicate.

That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.

If you would like to learn more about this particular feature, see this article on the Minecraft Wiki.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
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