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  1. Minecraft: Java Edition
  2. MC-163978

Mobs can spawn on moving blocks (block 36)

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • 1.14.4, 19w42a, 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, 20w06a, 20w07a, 20w08a, 20w10a, 20w11a, 20w17a, 20w18a, 20w20b, 20w21a, 1.16 Pre-release 1, 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, 20w28a, 20w30a, 1.16.2 Pre-release 1, 1.16.2 Pre-release 3, 1.16.2, 1.16.3 Release Candidate 1, 1.16.3, 1.16.4, 20w45a, 20w46a, 20w48a, 20w49a, 20w51a, 21w08b, 21w11a, 21w15a, 1.17 Pre-release 1, 1.17 Release Candidate 1, 1.17.1, 21w37a, 1.18.1, 22w05a, 1.18.2, 22w11a, 22w14a, 1.19, 1.19.2, 1.19.3 Pre-release 3, 1.19.3, 1.19.4, 1.20 Pre-release 1, 1.20 Pre-release 6, 1.20, 1.20.1 Release Candidate 1, 1.20.1, 23w33a, 1.20.2 Pre-release 1, 1.20.2, 23w42a, 1.20.4, 24w07a, 1.20.6, 24w20a, 1.21.1, 24w38a, 1.21.3, 1.21.4
    • Confirmed
    • Mob spawning
    • Low
    • Platform

      The bug

      Mobs can spawn on moving blocks, (i.e., blocks pushed by pistons), even if they should not be able to spawn on these blocks.

      Video

      https://www.youtube.com/watch?v=lW9Bk-U3vGY

      To reproduce

      A structure file that can be used to reproduce this issue has been attached to this ticket.

        1. block36_platform.nbt
          3 kB
        2. 2019-10-18_23.41.19.png
          2019-10-18_23.41.19.png
          309 kB
        3. 2019-10-18_16.23.51.png
          2019-10-18_16.23.51.png
          427 kB
        4. 2019-10-18_00.21.16.png
          2019-10-18_00.21.16.png
          566 kB
        5. 2019-10-18_00.18.56.png
          2019-10-18_00.18.56.png
          394 kB

            Unassigned Unassigned
            Robot_005 Robot
            Votes:
            37 Vote for this issue
            Watchers:
            23 Start watching this issue

              Created:
              Updated:
              CHK: