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  1. Minecraft: Java Edition
  2. MC-142520

Mob physics break upon loading a world in 19w03a

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: Minecraft 19w03a
    • Fix Version/s: Minecraft 19w03b
    • Labels:
    • Environment:

      Java version is up to date, 1.8.0_171. Windows 10, multi-core laptop. DoMobSpawning had been previously disabled, but was enabled while testing this. A Superflat world 

    • Confirmation Status:
      Unconfirmed

      Description

      Upon loading a world that has multiple entities confined in a small space or up against a wall while affected by a water current especially a 1x1 area, the entities will phase through the terrain, escaping captivity and creating a huge mess. They do not seem to fall through floors, but will go straight through multiple-block-thick walls. The force that propels them seems to be mob overlap repulsion, but it can also occur with water, allowing this bug to affect a single mob with nothing (but walls) nearby.

      If I had to guess, the issue is that mobs begin moving before terrain physics are loaded properly - when you load into a world, you can catch a solid five seconds in which chickens flap their wings as if they were airborne. For some reason, this does not affect the player at all.

        Attachments

        1. 2019-01-17_10.38.38.png
          2019-01-17_10.38.38.png
          1.21 MB
        2. 2019-01-17_10.38.42.png
          2019-01-17_10.38.42.png
          580 kB
        3. 2019-01-17_10.38.46.png
          2019-01-17_10.38.46.png
          1.39 MB
        4. 2019-01-17_10.40.09.png
          2019-01-17_10.40.09.png
          1.42 MB
        5. 2019-01-17_10.40.22.png
          2019-01-17_10.40.22.png
          1.95 MB
        6. 2019-01-17_10.47.40.png
          2019-01-17_10.47.40.png
          935 kB

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              • Assignee:
                Unassigned
                Reporter:
                The_Endgineer Jacob Andrew Jagiella
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                Dates

                • Created:
                  Updated:
                  Resolved: