Uploaded image for project: 'Minecraft: Java Edition'
  1. Minecraft: Java Edition
  2. MC-12363

Lava / water / powder snow bucket desync when using it while rapidly turning

XMLWordPrintable

    • Icon: Bug Bug
    • Resolution: Fixed
    • Minecraft 14w30c, 21w11a
    • Minecraft 1.5, Minecraft 1.6.1, Minecraft 1.6.2, Minecraft 1.7.4, Minecraft 14w27b, Minecraft 1.8, Minecraft 1.8.1-pre3, Minecraft 1.8.8, Minecraft 15w31c, Minecraft 15w35e, Minecraft 15w43a, Minecraft 15w46a, Minecraft 1.10.2, Minecraft 16w42a, Minecraft 1.12, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.12.1, Minecraft 1.12.2, Minecraft 18w03b, Minecraft 18w10d, Minecraft 18w20c, Minecraft 1.13-pre2, Minecraft 1.13-pre3, Minecraft 1.13-pre8, Minecraft 1.13-pre9, Minecraft 1.13-pre10, Minecraft 1.13, Minecraft 18w30b, Minecraft 18w31a, Minecraft 18w32a, Minecraft 18w33a, Minecraft 1.13.1-pre1, Minecraft 1.13.1, Minecraft 1.13.2-pre1, Minecraft 1.13.2-pre2, Minecraft 1.13.2, Minecraft 18w43b, Minecraft 18w45a, Minecraft 18w46a, Minecraft 18w49a, Minecraft 19w02a, Minecraft 19w03a, Minecraft 19w05a, Minecraft 19w06a, Minecraft 19w07a, Minecraft 19w08a, Minecraft 19w09a, Minecraft 19w11a, Minecraft 19w11b, Minecraft 19w12b, Minecraft 19w13a, Minecraft 19w13b, Minecraft 19w14a, Minecraft 19w14b, Minecraft 1.14 Pre-Release 1, Minecraft 1.14 Pre-Release 2, Minecraft 1.14 Pre-Release 3, Minecraft 1.14 Pre-Release 4, Minecraft 1.14 Pre-Release 5, Minecraft 1.14, Minecraft 1.14.1, Minecraft 1.14.2 Pre-Release 1, Minecraft 1.14.2 Pre-Release 2, Minecraft 1.14.2, Minecraft 1.14.3 Pre-Release 2, Minecraft 1.14.3, Minecraft 1.14.4 Pre-Release 1, Minecraft 1.14.4 Pre-Release 3, Minecraft 1.14.4 Pre-Release 4, Minecraft 1.14.4 Pre-Release 5, Minecraft 1.14.4 Pre-Release 6, 1.14.4, 19w34a, 19w35a, 19w36a, 19w37a, 19w38b, 19w39a, 19w40a, 19w41a, 19w42a, 19w45b, 19w46b, 1.15 Pre-release 1, 1.15 Pre-Release 2, 1.15 Pre-release 3, 1.15 Pre-release 4, 1.15 Pre-release 5, 1.15 Pre-release 6, 1.15 Pre-release 7, 1.15, 1.15.1, 1.15.1 Pre-release 1, 1.15.2 Pre-Release 1, 1.15.2 Pre-release 2, 1.15.2, 20w06a, 20w07a, 20w08a, 20w09a, 20w10a, 20w11a, 20w12a, 20w13a, 20w13b, 20w14a, 20w15a, 20w17a, 20w18a, 20w19a, 20w20a, 20w20b, 20w21a, 20w22a, 1.16 Pre-release 1, 1.16 Pre-release 2, 1.16 Pre-release 3, 1.16 Pre-release 5, 1.16 Pre-release 6, 1.16 Pre-release 7, 1.16 Pre-release 8, 1.16 Release Candidate 1, 1.16, 1.16.1, 20w28a, 20w30a, 1.16.2 Pre-release 1, 1.16.2 Release Candidate 1, 1.16.2 Release Candidate 2, 1.16.2, 1.16.3 Release Candidate 1, 1.16.3, 1.16.4 Pre-release 1, 1.16.4 Pre-release 2, 1.16.4 Release Candidate 1, 1.16.4, 20w45a, 20w46a, 20w48a, 20w49a, 20w51a, 21w03a, 1.16.5, 21w05a, 21w05b, 21w06a, 21w07a, 21w08b, 21w10a
    • Confirmed
    • Survival
    • Block states, Networking
    • Important

      The bug

      A desync can happen when rapidly turning and trying to use a lava, water, or powder snow bucket. The bucket might appear full but you placed lava / water / powder snow; or the bucket might appear empty but you did not place lava / water / powder snow.

      How to reproduce

      1. Give yourself a lava bucket
      2. Spin around (move mouse) standing on a flat plain and repeatedly try to put down and pick up the lava in the bucket
        → About 1 in 10 times, the client and server desync (e.g. I see the lava on the ground, and also in my bucket, until I use the bucket again or move it in my inventory; or I see no lava on the ground and my inventory displays the bucket as empty, but I actually still have lava and can place it).

      Code analysis

      Based on 1.12.2 decompiled using MCP 9.40

      Using a bucket calls server-side net.minecraft.item.ItemBucket.onItemRightClick(World, EntityPlayer, EnumHand) which calculates the position itself and therefore can cause a desync. Ideally the position for picking up liquids and placing them should be calculated client-side only and then the server should only validate it and use that position.

      Examples

        1. 2018-08-31_11.56.14.png
          640 kB
          Fibrowolf
        2. 2018-08-31_11.56.24.png
          676 kB
          Fibrowolf
        3. 2020-06-18_17.23.47.png
          601 kB
          robin
        4. 2020-12-07_09.48.56.png
          1.20 MB
          Laurens
        5. 2021-06-12_13.18.47.png
          593 kB
          Marxalous
        6. CEa9-rIWoAAT7YU.jpg
          90 kB
          Meri Diana
        7. Disappearance of water.mp4
          1.50 MB
          Ludmyna
        8. lava block desync.mp4
          9.00 MB
          Laurens
        9. LiquidDesync.mp4
          721 kB
          [Mojang] Panda
        10. MC-12363 not fixed..mp4
          8.20 MB
          bugsbugsbugs
        11. Minecraft_bug.mp4
          7.48 MB
          [Mod] Michael Wobst
        12. powder snow 20w48a.mp4
          8.70 MB
          Laurens
        13. PowderSnowBug.mp4
          7.73 MB
          Adam V Howard
        14. powder snow entity 20w48a.mp4
          8.89 MB
          Laurens
        15. water desync.mp4
          9.15 MB
          Laurens
        16. water place item desync.mp4
          5.35 MB
          Laurens
        17. Water source pre8.gif
          8.85 MB
          [Helper] ZeNico13

            panda4994 [Mojang] Panda
            Avoma [Mod] Avoma
            Votes:
            138 Vote for this issue
            Watchers:
            55 Start watching this issue

              Created:
              Updated:
              Resolved:
              CHK: