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  1. Minecraft (Bedrock codebase)
  2. MCPE-78840

Instant despawn radius for simulation distance = 4 is too short



    • Type: Bug
    • Status: Resolved
    • Resolution: Works As Intended
    • Affects Version/s: Beta
    • Fix Version/s: None
    • Labels:
    • Confirmation Status:
    • Platform:
    • ADO:


      The beta introduces scaled instant despawn radius based on simulation distance. The radii for simulation distances 6 and 8 appear to be consistent with the forumula

      (simulation_distance * 16) - 10

      so that the instant despawn radius for sim 8 is 118, and the instant despawn radius for sim 6 is 86. This is consistent with the previous instant despawn radius since beta being 54 based on the minimum simulation distance of 4. However, in, the instant despawn radius for sim 4 is 44 instead of 54. This appears to be a typo because it is inconsistent with the others, and because it causes mobs to be instantly despawned after they are spawned between r44 and r54.

      Steps to reproduce
      1. Set world simulation distance to 4
      2. Allow a mob to spawn naturally and do not interact with it.
      3. Move 44 blocks away from the mob.

      Expected result
      The mob stays in existence.

      Actual result
      The mob instantly despawns.

      The attached test world contains a non-persistent creeper trapped at 0, 110, 0, and colored glass at Z = 44, 54, 86, and 118 to facilitate testing different instant despawn radii. Change the simulation distance of the world before opening it to test a particular distance.


        1. Despawn Test.mcworld
          33 kB
          [Mod] GoldenHelmet
        2. Screenshot from 2020-05-16 17-24-45.png
          25 kB
          Reed Cartwright
        3. Screenshot from 2020-05-16 17-26-06.png
          32 kB
          Reed Cartwright
        4. Screenshot from 2020-05-16 17-28-36.png
          37 kB
          Reed Cartwright
        5. Screenshot from 2020-05-17 21-04-15.png
          35 kB
          Reed Cartwright
        6. Screenshot from 2020-05-17 21-08-32.png
          37 kB
          Reed Cartwright
        7. Screenshot from 2020-05-19 18-22-43.png
          59 kB
          Reed Cartwright
        8. Screenshot from 2020-05-19 18-23-58.png
          55 kB
          Reed Cartwright

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              GoldenHelmet [Mod] GoldenHelmet
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