Put on the motion part of the piston plate and the piston will not move.
Video: https://youtu.be/Xz9Z8sTxNmk
Comments 3
Thank you for your report!
We're actually already tracking this issue in MC-58635, 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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This is intentional, sign is a tile entity like chests or furnaces and cannot be moved by piston