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  1. Minecraft: Java Edition
  2. MC-254385

You can create pistons with two piston heads

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • 1.19, 1.19.1 Release Candidate 2, 1.19.1, 1.19.2, 22w42a, 1.19.3, 23w04a, 1.19.4 Release Candidate 2, 1.19.4, 23w12a, 23w14a, 1.20.1, 1.20.4, 24w20a, 1.21, 24w34a, 24w39a, 24w40a, 1.21.3
    • None
    • Confirmed
    • Networking
    • Low
    • Platform

      When a piston is placed by a player who then turns their head away before the server registers the placement, a second piston head will visually appear extending from a different side of the piston. This piston head is only the result of a client-server desync, since right-clicking on it or saving and reloading the world makes it disappear.

      How to reproduce:

      This is the most consistent way I've found to reproduce this issue. A video of these steps is attached below: MC-254385.mp4

      1. Place a redstone block.
      2. Position yourself one block diagonally away from the redstone block.
      3. Give yourself a piston.
      4. Run the command: 
        /tick rate 1
      5. Rotate the camera so that you are looking at the redstone block at an angle of exactly 45, 135, -135 or -45 degrees.
      6. Turn slightly to your left (or right).
      7. Right-click with your piston on the redstone block and quickly turn slightly to the right (or left, respectively) of the diagonal you were previously facing.
        → The piston grows two heads.

      Expected result:

      A piston with one piston head would be normally placed.

      Observed result:

      A piston with two piston heads facing different directions was placed.

        1. 2022-07-20_19.31.03.png
          2.09 MB
          Egor korkin
        2. 2022-07-20_21.05.29.png
          1.53 MB
          Egor korkin
        3. 2022-07-20_21.26.58.png
          1.41 MB
          Egor korkin
        4. 2022-07-23_21.56.19.png
          564 kB
          [Mod] ampolive
        5. 2024-03-23_16.52.23.png
          1.66 MB
          GuiyoTBA
        6. Capture.PNG
          251 kB
          Talon Nicholson
        7. MC-254385.mp4
          2.38 MB
          [Helper] ManosSef
        8. setup.png
          983 kB
          [Mod] ampolive

            Unassigned Unassigned
            ManosSef [Helper] ManosSef
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            16 Vote for this issue
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              Created:
              Updated:
              CHK: