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  1. Minecraft: Java Edition
  2. MC-157645

Mobs cannot pathfind properly on bottom slabs, farmland, grass paths, and other blocks without a solid top face without blocks below

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    Details

    • Type: Bug
    • Status: Open
    • Resolution: Unresolved
    • Affects Version/s: 1.14.4, 19w38b
    • Fix Version/s: None
    • Labels:
      None
    • Confirmation Status:
      Confirmed
    • Category:
      Mob behaviour

      Description

      The bug

      Mobs cannot pathfind properly and thus move very quickly on blocks without a solid top face if those blocks have air blocks below them.

      This is known to affect the following blocks (list may be incomplete):

      • Bottom slabs
      • Farmland
      • Grass paths
      • (Empty) end portal frames
      • Enchanting tables
      • Carpets above string
      • Chests

      It seems to be affecting all mobs, though it seems like the issue is best reproduced with skeletons due to their strafing.

      To reproduce

      1. Create a "Redstone Ready" flatland world
      2. Run /fill ~ ~-2 ~ ~20 ~-12 ~20 air
      3. Run /fill ~ ~-1 ~ ~20 ~-1 ~20 oak_slab (or any other affected block)
      4. Give yourself some skeleton spawn eggs
      5. Switch into survival mode
      6. Spawn a skeleton on top of the slabs
        The skeleton moves really quickly

      Video

      https://youtu.be/rNsKKNCFxMM

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              • Assignee:
                Unassigned
                Reporter:
                Biggles Casimir Leja
              • Votes:
                3 Vote for this issue
                Watchers:
                2 Start watching this issue

                Dates

                • Created:
                  Updated:
                  CHK: