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  1. Minecraft: Java Edition
  2. MC-254614

Shulkers at Y levels that are a multiple of 16 don't activate pressure plates or tripwire below them

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • 1.19, 1.19.1 Release Candidate 3, 1.19.1, 1.19.2, 1.19.3 Pre-release 2, 1.19.3 Pre-release 3, 1.19.3, 1.19.4 Release Candidate 2, 1.19.4, 1.20, 1.20.1 Release Candidate 1, 1.20.1, 1.20.2, 1.20.3 Pre-Release 2, 1.20.4, 1.20.5 Release Candidate 2, 1.20.5, 1.20.6 Release Candidate 1, 1.20.6, 1.21, 1.21.1, 1.21.2
    • None
    • Confirmed
    • Collision, Entities, Redstone
    • Normal
    • Platform

      Steps to Reproduce:

      Spawn shulker at a Y level that is a multiple of 16 on the underside of a block
      Place pressure plate one block below the shulker
      Get the shulker to open (switch to survival)

      Observed Results:
      Pressure plate will fail to activate when the shulker opens.

      Expected Results:
      Pressure plate should activate when the shulker opens.

      Notes:
      I have tested at every Y level in 1.19 and for completeness the Y levels at which a shulker do no activate a pressure plate below them are; 304, 288, 272, 256, 240, 224, 208, 192, 176, 160, 144, 128, 112, 96, 80, 64, 48, 32, 16, 0, -16, -32, -48.

      I have run some smaller scale tests that show 1.18.2 does not exhibit this behavior while 1.19.1_rc3 does.

      Code Analysis:
      Code analysis by Volbla can be found in this comment.

        1. 1.18.2_string.png
          1.18.2_string.png
          366 kB
        2. 1.18.2.png
          1.18.2.png
          244 kB
        3. 1.19_string.png
          1.19_string.png
          403 kB
        4. 1.19.png
          1.19.png
          284 kB
        5. ShulkerTest1.17.zip
          693 kB
        6. shulkertest1.21.2.mp4
          459 kB

            Unassigned Unassigned
            theDonkers theDonkers
            Votes:
            8 Vote for this issue
            Watchers:
            3 Start watching this issue

              Created:
              Updated:
              CHK: