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  1. Minecraft: Java Edition
  2. MC-1836

Mobs glitch through half slabs and unsync between server and client

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Duplicate
    • Affects Version/s: Minecraft 1.4.2, Minecraft 1.4.3
    • Fix Version/s: None
    • Labels:
      None
    • Environment:
      Windows 7, Java 1.7.0_05
    • Confirmation Status:
      Unconfirmed
    • Game Mode:
      Survival

      Description

      Mobs sometimes glitch when walking across a floor made of half slabs without anything under it. I've directly seen two results, and believe there is a third one:

      • More commonly, a "ghost" of the mob drops through the half slab floor; it can't be attacked or interacted with in any way. It sometimes makes yo-yo movements and after a time jumps to where he fell from. Appears to happen when the mob glitches only on the client.
      • Less commonly, the mob really drops through the floor.
      • I believe sometimes the glitch happens only server-side; I've been hounded by invisible skeletons under my mob grinder completely made of half-slabs. Not sure, though, because I obviously can't see the invisible skeletons falling through the floor.

      Saw all the above problems in Survival, in a heavily modded game, when I made a mob grinder almost entirely out of half slabs in a Skyblock-like map in order to save materials; reproduced the ghost mobs issue on Creative, in both Vanilla 1.4.2 and the 1.4.3 pre-release. The other issues are way rarer.

      The attached file is a creative world with a copy of my mob grinder entirely made of half slabs; I typically see a few ghost mobs in less than a minute after loading that world.

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              • Assignee:
                Unassigned
                Reporter:
                schmidtcapela Fabio Oliveira Schmidt Capela
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                Dates

                • Created:
                  Updated:
                  Resolved:
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