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  1. Minecraft: Java Edition
  2. MC-133354

Kelp and sea grass grows up into flowing water and makes it a source block


    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13-pre9, Minecraft 1.13, Minecraft 18w30b, Minecraft 18w31a, Minecraft 18w32a, Minecraft 18w33a, Minecraft 1.13.1-pre1, Minecraft 1.13.1-pre2, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 18w47b, Minecraft 19w11b, Minecraft 19w12a, Minecraft 1.14.2, Minecraft 1.14.3, 1.15.2, 20w07a, 1.16, 1.16.1, 20w29a, 1.16.2, 1.16.4 Pre-release 2, 1.16.4, 20w49a, 21w03a, 21w06a, 21w11a, 21w14a, 1.17, 1.17.1, 21w39a, 1.18.1, 1.18.2, 22w17a, 1.19, 1.19.2, 1.19.4, 23w17a, 1.20.1, 1.20.3 Release Candidate 1
    • Confirmed
    • Block states
    • Low
    • Gameplay

      The bug

      Kelp and sea grass (when bone meal is used) can grow into flowing water blocks, not just sources, and as a byproduct of that, the flowing water becomes a source block.

      How to reproduce

      1. Create a water column of source blocks, with flowing water at the top
      2. Place kelp at the bottom and watch it grow (bumping up random tick speed if needed)
      3. Observe the flowing water at the top is now a source block. (destroying the top kelp and using a bucket or debug screen can confirm this)

      Code analysis

      Code analysis by Avoma can be found in this comment.

        1. 2018-07-12_20.40.55.png
          411 kB
        2. 2018-07-12_20.40.57.png
          430 kB
        3. 2019-08-11_19.03.26.png
          210 kB
        4. 2019-08-11_19.03.46.png
          194 kB
        5. MC-133354.mp4
          4.02 MB

            Unassigned Unassigned
            qwerty23495 [Mod] Matthew
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