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  1. Minecraft: Java Edition
  2. MC-7809

Aiming at the very bottom of a side of an upper slab/stair places slabs/stairs right-side up in multiplayer

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Minecraft 1.8, Minecraft 16w39c
    • Minecraft 1.4.7, Snapshot 13w03a, Minecraft 1.5, Snapshot 13w11a, Minecraft 1.5.1, Minecraft 1.6.4, Minecraft 13w42b, Minecraft 13w43a, Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 1.8.1, Minecraft 1.8.3, Minecraft 1.8.4, Minecraft 1.8.5, Minecraft 1.8.6, Minecraft 1.8.7, Minecraft 1.8.8, Minecraft 15w44b, Minecraft 1.8.9, Minecraft 1.9.2, Minecraft 1.9.4, Minecraft 16w20a, Minecraft 1.10.2
    • Confirmed

      Just place a slab of any kind on the upper side of a block many times, and you'll sometime get one that converts to being on the bottom side of a block.

      Description from MC-89850

      When placing top- or bottom aligned blocks like slabs and stairs server and client disagree about the alignment of placed blocks

      Doesn't happen in single player (or isn't visible), but on dedicated server or Realms.

      Steps to reproduce:

      • Place a block with a well defined center (e.g. stone bricks) at ca. eye level
      • Take a stair or slab
      • Aim slightly above the center of the block
      • Place block

      The results:

      • Client places the block at the correct top alignment
      • Server overwrites the block a split second later at incorrect bottom alignment

      Screenshots show before and after placement (the in-between position is quite difficult to capture)

      Code analysis by Panda4994 in this comment.

        1. 2013-01-20_00.38.51.png
          2013-01-20_00.38.51.png
          58 kB
        2. 2015-10-05_00.57.38.png
          2015-10-05_00.57.38.png
          314 kB
        3. 2015-10-05_00.57.51.png
          2015-10-05_00.57.51.png
          215 kB

            grum [Mojang] Grum (Erik Broes)
            halgdp Halgdp Halgdp
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              Created:
              Updated:
              Resolved:
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