i was just trying to make a piston door and i notice that 1 piston cant push another and no the piston in front was not powered first the one in back was pushing first but it couldn't move the 1 in front like it was made or obsidian or a immovable object
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-88396. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.