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  1. Minecraft: Java Edition
  2. MC-54026

Blocks attached to slime blocks can create ghost blocks

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    • Icon: Bug Bug
    • Resolution: Cannot Reproduce
    • None
    • Minecraft 14w18a, Minecraft 14w21b, Minecraft 1.8, Minecraft 1.8.1-pre3, Minecraft 1.8.8, Minecraft 15w47c, Minecraft 1.8.9, Minecraft 1.9 Pre-Release 3, Minecraft 1.9, Minecraft 1.9.2, Minecraft 1.10.2, Minecraft 16w39b, Minecraft 16w39c, Minecraft 16w43a, Minecraft 16w44a, Minecraft 1.11 Pre-Release 1, Minecraft 1.11, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 17w13b, Minecraft 17w14a, Minecraft 17w15a, Minecraft 17w17b, Minecraft 17w18a, Minecraft 17w18b, Minecraft 1.12 Pre-Release 1, Minecraft 1.12 Pre-Release 2, Minecraft 1.12 Pre-Release 3, Minecraft 1.12 Pre-Release 5, Minecraft 1.12 Pre-Release 6, Minecraft 1.12 Pre-Release 7, Minecraft 1.12, Minecraft 17w31a, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.12.1, Minecraft 1.12.2 Pre-Release 1, Minecraft 1.12.2 Pre-Release 2, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b, Minecraft 17w45a, Minecraft 17w48a, Minecraft 17w50a, Minecraft 18w02a, Minecraft 18w05a, Minecraft 18w06a, Minecraft 18w07b, Minecraft 18w07c, Minecraft 18w08a, Minecraft 18w08b, Minecraft 18w10a, Minecraft 18w10d, Minecraft 1.13-pre1, Minecraft 1.13-pre3
    • Confirmed
    • (Unassigned)

      16w39c reproduction case in MC-108310.

      Blocks that are attached to slime blocks can create ghosts blocks if a piston that's receiving a 1-tick pulse pushes the slime block
      This very short video explains everything:
      https://www.youtube.com/watch?v=HH_FlU6wZW0

      To reproduce, download the attached test world (bug_world_MC-54026.zip), press the button to let the machine go up, and then press the upper button for it to go down. Repeat until ghost blocks occur.

      World with example contraption provided. It may be necessary to increase the height of the thing to get it to bug out. I've only ever seen it occur on the way down.

      There is a button on the bottom for it to go up as well as at the top to make it go down. Movement is triggered by block updates so if you do something to block its path and it stops moving, just place and break a block near the BUD switch and it will start moving again.

      Matt D. on SPIGOT-3015

      Suggested fix by gnembon can be found in fix_pistonGhostBlocks.PNG; explanation can be found in this comment

        1. 2017-01-31_20.56.15.png
          2017-01-31_20.56.15.png
          688 kB
        2. 2017-06-02_14.30.18.png
          2017-06-02_14.30.18.png
          109 kB
        3. bug_world_MC-54026.zip
          253 kB
        4. BzqwEv7.png
          BzqwEv7.png
          33 kB
        5. fix_pistonGhostBlocks.PNG
          fix_pistonGhostBlocks.PNG
          116 kB
        6. MC-54026.png
          MC-54026.png
          218 kB
        7. New World.zip
          50 kB

            Unassigned Unassigned
            Shizz0 Kevin Sandig
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              Created:
              Updated:
              Resolved:
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