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  1. Minecraft: Java Edition
  2. MC-134847

Mobs can't path find on bottom half slabs


    • Icon: Bug Bug
    • Resolution: Fixed
    • Minecraft 1.13, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 18w47b, Minecraft 18w48a, Minecraft 18w48b, Minecraft 19w06a, Minecraft 19w12b, Minecraft 19w13a, Minecraft 1.14 Pre-Release 2, Minecraft 1.14
    • Confirmed
    • Mob behaviour

      The bug

      All mobs recognize bottom half slabs as air blocks and therefore

      • can't pathfind on them if there are no blocks below them
      • try to pathfind through them when they can't

      How to reproduce

      1. Create a void world
      2. Replace the starting platform by either lower slabs or air
      3. Build the test setup from the screenshots 2018-08-25_11.23.49.png and/or 2018-08-25_11.17.58.png (armor stand marks player position)
      4. Go to where the armor stand is located in the screenshots above
      5. Switch to survival mode

      In the first setup, the zombie will only be able to walk towards the player until the stone blocks end. In the second setup, the zombie will take the path that goes straight towards the player and gets stuck in the stone slab.

      There are a few videos attached to this report which also showcase this issue.

      Original report

      Mobs wont pathfind on only slabs when there is a block underneath its fine like in clip 1.

      When there is a gap they will only pathfind when the blocks underneath them are connected to the blocks they want to go(clip 3).

      I think they don't see slabs as blocks they can pathfind over, they think they fall through them.

        1. 2018-08-25_11.17.58.png
          33 kB
        2. 2018-08-25_11.23.49.png
          50 kB
        3. 2019-04-17_15.55.00.png
          949 kB
        4. 2019-04-28_18.42.21.png
          1.36 MB
        5. Minecraft Slab bug.mp4
          5.07 MB
        6. Minecraft Slab bug2.mp4
          8.59 MB
        7. Minecraft Slab bug3.mp4
          9.98 MB
        8. Screenshot_2019-03-15-18-54-37.png
          327 kB

            Unassigned Unassigned
            Th3Luk4s Lukas Kieber
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            21 Start watching this issue