I don't know if this is an error, but it seems to me that it is, since the signal is transmitted to the piston via air.
Linked issues
Attachments
Comments 2
Hi!
Thank you for your report!
We've already resolved this issue at MC-108 , so I will close and link this ticket as a Duplicate.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Thank you for helping us improve Minecraft! We saved your files: