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  1. Minecraft: Java Edition
  2. MC-96219

Block Duplication Bug with Pistons (ghost blocks)


    • Icon: Bug Bug
    • Resolution: Fixed
    • Minecraft 16w04a, Minecraft 1.9 Pre-Release 1, Minecraft 1.9 Pre-Release 2, Minecraft 1.9 Pre-Release 3, Minecraft 1.9 Pre-Release 4, Minecraft 1.9
    • None
    • Singleplayer
    • Community Consensus

      I found a series duplication bug involving pistons and slime blocks.

      If a sticky piston extends by a 1-Redstone Tick pulse and pushes slime blocks sticked to adjacent blocks, the sticked blocks aren't converted to moving blocks. Thus, clones of the blocks are created at where the unconverted blocks were supposed to go, resulting in a duplication.
      Although, once the sticky piston pulls the slime blocks back after receiving another 1-tick pulse, the cloned blocks are lost (returns to "Before" picture).

      Anyway, please fix this bug, Mojang. You probably don't want this to be exploited to the extreme. Right?

            ProfMobius ProfMobius (Thomas Guimbretiere)
            ForeverMaster0 Forever Master
            12 Vote for this issue
            15 Start watching this issue