Uploaded image for project: 'Minecraft: Java Edition'
  1. Minecraft: Java Edition
  2. MC-4

Item drops sometimes appear at the wrong location

XMLWordPrintable

    • Icon: Bug Bug
    • Resolution: Unresolved
    • Minecraft 1.8.1-pre1
    • Minecraft 1.4.1, Minecraft 1.4.4, Minecraft 1.4.5, Minecraft 1.4.6, Minecraft 1.4.7, Snapshot 13w02a, Snapshot 13w02b, Snapshot 13w04a, Snapshot 13w10b, Minecraft 1.5, Snapshot 13w11a, Minecraft 1.5.1, Minecraft 1.5.2, Snapshot 13w19a, Snapshot 13w21a, Snapshot 13w21b, Minecraft 1.6.1, Minecraft 1.6.2, Minecraft 1.6.4, Minecraft 13w38a, Minecraft 13w38b, Minecraft 13w38c, Minecraft 13w39b, Minecraft 13w41a, Minecraft 13w41b, Minecraft 13w42a, Minecraft 13w42b, Minecraft 13w43a, Minecraft 1.7, Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 13w48a, Minecraft 13w48b, Minecraft 13w49a, Minecraft 1.7.3, Minecraft 1.7.4, Minecraft 14w02b, Minecraft 14w02c, Minecraft 14w03a, Minecraft 14w03b, Minecraft 14w04a, Minecraft 14w04b, Minecraft 14w05a, Minecraft 14w05b, Minecraft 14w06a, Minecraft 14w06b, Minecraft 14w08a, Minecraft 1.7.5, Minecraft 14w10b, Minecraft 14w10c, Minecraft 14w11b, Minecraft 1.7.8, Minecraft 1.7.9, Minecraft 14w17a, Minecraft 14w18b, Minecraft 14w20b, Minecraft 14w21a, Minecraft 14w21b, Minecraft 1.7.10, Minecraft 14w30b, Minecraft 14w30c, Minecraft 14w32a, Minecraft 14w32b, Minecraft 14w32c, Minecraft 14w32d, Minecraft 14w33c, Minecraft 14w34a, Minecraft 14w34b, Minecraft 14w34c, Minecraft 14w34d, Minecraft 1.8-pre3, Minecraft 1.8, Minecraft 1.8.1-pre1, Minecraft 1.8.1-pre3, Minecraft 1.8.1, Minecraft 1.8.3, Minecraft 1.8.4, Minecraft 1.8.8, Minecraft 15w40b, Minecraft 15w43a, Minecraft 15w43c, Minecraft 15w44a, Minecraft 15w46a, Minecraft 15w47a, Minecraft 15w47b, Minecraft 15w47c, Minecraft 15w49a, Minecraft 1.8.9, Minecraft 15w51b, Minecraft 16w02a, Minecraft 16w03a, Minecraft 16w04a, Minecraft 16w05b, Minecraft 16w06a, Minecraft 1.9, Minecraft 1.9.1 Pre-Release 1, Minecraft 1.9.1 Pre-Release 2, Minecraft 1.9.1 Pre-Release 3, Minecraft 1.9.1, Minecraft 1.9.2, Minecraft 16w14a, Minecraft 1.9.3 Pre-Release 3, Minecraft 1.9.3, Minecraft 1.9.4, Minecraft 16w20a, Minecraft 16w21a, Minecraft 16w21b, Minecraft 1.10 Pre-Release 1, Minecraft 1.10 Pre-Release 2, Minecraft 1.10, Minecraft 1.10.1, Minecraft 1.10.2, Minecraft 16w32a, Minecraft 16w32b, Minecraft 16w33a, Minecraft 16w35a, Minecraft 16w36a, Minecraft 16w39a, Minecraft 16w39b, Minecraft 16w39c, Minecraft 16w40a, Minecraft 16w41a, Minecraft 16w42a, Minecraft 16w44a, Minecraft 1.11 Pre-Release 1, Minecraft 1.11, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 17w13b, Minecraft 17w17a, Minecraft 17w17b, Minecraft 1.12 Pre-Release 5, Minecraft 1.12, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.12.1, Minecraft 1.12.2 Pre-Release 1, Minecraft 1.12.2 Pre-Release 2, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b, Minecraft 18w03b, Minecraft 18w05a, Minecraft 18w11a, Minecraft 18w14a, Minecraft 18w14b, Minecraft 18w15a, Minecraft 18w16a, Minecraft 18w19a, Minecraft 18w19b, Minecraft 18w20a, Minecraft 18w20b, Minecraft 18w20c, Minecraft 18w21a, Minecraft 18w21b, Minecraft 18w22b, Minecraft 18w22c, Minecraft 1.13-pre1, Minecraft 1.13-pre2, Minecraft 1.13-pre3, Minecraft 1.13-pre4, Minecraft 1.13-pre5, Minecraft 1.13-pre6, Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13-pre10, Minecraft 1.13, Minecraft 18w30a, Minecraft 18w30b, Minecraft 18w31a, Minecraft 18w32a, Minecraft 18w33a, Minecraft 1.13.1, Minecraft 1.13.2-pre1, Minecraft 1.13.2-pre2, Minecraft 1.13.2, Minecraft 18w43b, Minecraft 18w43c, Minecraft 18w44a, Minecraft 18w45a, Minecraft 18w46a, Minecraft 18w47a, Minecraft 18w47b, Minecraft 18w48a, Minecraft 18w48b, Minecraft 18w49a, Minecraft 18w50a, Minecraft 19w02a, Minecraft 19w03a, Minecraft 19w05a, Minecraft 19w06a, Minecraft 19w07a, Minecraft 19w12b, Minecraft 19w13b, Minecraft 19w14a, Minecraft 19w14b, 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 Pre-Release 1, Minecraft 1.14.1, Minecraft 1.14.2 Pre-Release 1, Minecraft 1.14.2 Pre-Release 2, Minecraft 1.14.2 Pre-Release 3, Minecraft 1.14.2 Pre-Release 4, Minecraft 1.14.3, 1.14.4, 19w37a, 19w38b, 19w39a, 19w40a, 19w41a, 19w42a, 19w44a, 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, 20w14a, 20w15a, 20w16a, 20w17a, 20w18a, 20w21a, 20w22a, 1.16 Pre-release 2, 1.16 Pre-release 3, 1.16 Pre-release 4, 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, 20w27a, 20w28a, 20w29a, 20w30a, 1.16.2 Pre-release 1, 1.16.2 Pre-release 2, 1.16.2 Pre-release 3, 1.16.2 Release Candidate 1, 1.16.2 Release Candidate 2, 1.16.2, 1.16.3, 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, 21w11a, 21w13a, 21w14a, 21w15a, 21w17a, 21w18a, 21w19a, 21w20a, 1.17 Pre-release 1, 1.17 Pre-release 2, 1.17, 1.17.1 Release Candidate 1, 1.17.1, 21w37a, 21w38a, 21w39a, 21w40a, 21w41a, 21w42a, 21w43a, 21w44a, 1.18 Pre-release 5, 1.18 Release Candidate 1, 1.18 Release Candidate 4, 1.18, 1.18.1 Pre-release 1, 1.18.1 Release Candidate 1, 1.18.1, 22w03a, 1.18.2, 22w11a, 22w12a, 22w14a, 22w15a, 1.19, 1.19.1 Release Candidate 2, 1.19.1, 1.19.2, 22w42a, 22w43a, 1.19.3 Release Candidate 3, 1.19.3, 23w03a, 23w04a, 23w07a, 1.19.4 Release Candidate 2, 1.19.4, 23w13a, 23w17a, 23w18a, 1.20 Pre-release 6, 1.20, 1.20.1, 23w31a, 23w32a, 1.20.2 Pre-release 2, 1.20.2, 23w41a, 23w43a, 23w44a, 1.20.4, 23w51b, 24w03b, 24w04a, 24w06a, 24w09a, 24w13a, 1.20.5 Pre-Release 1, 1.20.5, 1.20.6, 24w20a, 1.21 Release Candidate 1, 1.21, 24w33a, 1.21.1, 24w39a, 1.21.3, 24w45a, 1.21.4 Pre-Release 1
    • Confirmed
    • Entities, Items, Networking
    • Low
    • Platform

      The bug

      When an item lands on the edge of a block, the client sometimes makes it fall over the edge while the server leaves it on the edge. This happens because the client thinks the drop can fall based on a slightly different location and attempts to predict the future incorrectly.

      How to reproduce

      1. Throw an item on the ground and wait until it stopped moving
      2. Run in command block close to it: 
        teleport @e[type=item,distance=..6] ~ ~1 ~-0.6249

      Code analysis

      Code analysis by marcono1234 can be found in this comment.

      Fix

      Fix by Panda4994 can be found in this comment.

        1. 2016-08-10_17.29.13.png
          2016-08-10_17.29.13.png
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        2. 2016-08-10_17.29.16.png
          2016-08-10_17.29.16.png
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        3. 2021-02-03_20.08.05.png
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        4. 2021-05-12_14.43.55.png
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        5. 2021-05-12_14.43.58.png
          2021-05-12_14.43.58.png
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        6. Item desync after explosion (Minecraft 1.8).mp4
          6.26 MB
        7. MC-4.mp4
          4.69 MB
        8. MC-4-16w32a-rep.mov
          1.37 MB
        9. Minecraft bug MC-4 testcase backup.zip
          658 kB
        10. Minecraft bug MC-4 testcase for debug.zip
          2.33 MB

            Unassigned Unassigned
            ezekielelin [Mod] Ezekiel (ezfe)
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              Created:
              Updated:
              CHK: