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  1. Minecraft (Bedrock codebase)
  2. MCPE-29548

Relogging can cause observers to emit pulses

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • 1.21.40.20 Preview, 1.18.10.21 Beta, 1.18.0.24 Beta, 1.17.11 Hotfix, 1.17.0.50 Beta, 1.16.220, 1.16.100.58 Beta, 1.16.100.55 Beta, 1.16.100.53 Beta, 1.16.20.54 Beta, 1.16.20.53 Beta, 1.16.0.67 Beta, 1.16.0.63 Beta, 1.16.0.61 Beta, 1.16.0.57 Beta, 1.16.0.55 Beta, 1.16.0.53 Beta, 1.15.0.55 Beta, 1.15.0.54 Beta, 1.15.0.53 Beta, 1.15.0.51 Beta, 1.14.30.51 Beta, 1.14.2.51 Beta, 1.14.2.50 Beta, 1.14.0.51 Beta, 1.13.3, 1.13.1, 1.14.1 Hotfix, 1.14.0.3 Beta, 1.2.6.55, 1.2.6.60, 1.6.0.8 Beta, 1.8.0.11 Beta, 1.7.0, 1.9.0.3 Beta, 1.9.0, 1.11.0.5 Beta, 1.12.1, 1.13.0, 1.14.1.2 Beta, 1.14.0, 1.14.30 Hotfix, 1.14.60 Hotfix, 1.16.40 Hotfix, 1.16.201 Hotfix, 1.17.41 Hotfix, 1.18.0, 1.18.2 Hotfix, 1.18.10, 1.18.12 Hotfix, 1.18.30, 1.18.31, 1.19.0, 1.19.2 Hotfix, 1.19.30, 1.19.51, 1.19.63, 1.19.83 Hotfix, 1.20.51 Hotfix, 1.21.2 Hotfix, 1.21.22 Hotfix, 1.21.23 Hotfix, 1.21.40
    • None
    • Confirmed
    • Windows
    • 94243 / 95333

      Edit by depressed-pho, updated by GoldenHelmet:
      Original test world was unreliable because it had the observer looking at lit redstone dust across a chunk border. Test world and description updated to include other blocks on Novermber 2, 2021.

      Observers looking at several kinds of blocks emit a pulse on world reloading. The attached test world demonstrates the bug. The following blocks were tested in 1.17.41 Hotfix:

      Block Triggers observer pulse on relog
      Lit redstone dust
      unlit redstone dust
      Redstone torch (lit or unlit)
      Repeater (powered or unpowered)
      Comparator (powered or unpowered)
      Empty single chest
      Empty double chest
      Chest with item in it
      Dropper (empty or with item)
      Item frame
      Glow item frame
      Tripwire with mob on it
      Pressure plate with mob on it inconsistent
      Mob head
      Campfire
      Cauldron

      Steps to reproduce:

      1. Open the attached world.
      2. Close and open it again.
      3. See what the dispenser does.

      Strangely, the pulse is too short (0 ticks maybe?) for dispensers to trigger so you need a repeater to make the pulse a bit longer.

      I have created a contraption that, when not in use, constantly powers a series of dispensors. However, relogging with this contraption nearby unpowers and repowers the redstone, causing the dispensors to dispense their items without player interaction.

      Video shows the bug, and also the Minecraft version being run

        1. 2017-12-13 17-33-29.mp4
          6.14 MB
        2. 5652118A-5D9C-4E2A-A223-470B5E4664B3.jpeg
          5652118A-5D9C-4E2A-A223-470B5E4664B3.jpeg
          312 kB
        3. here it is.mp4
          6.56 MB
        4. MCPE-29548.mcworld
          87 kB
        5. MCPE-29548 Observers on reload.mcworld
          52 kB
        6. observer false trigger on relogging my world.png
          observer false trigger on relogging my world.png
          1.47 MB
        7. Screenshot_20220426-085459_Minecraft.jpg
          Screenshot_20220426-085459_Minecraft.jpg
          1.21 MB

            GunsAndChips GunsAndChips
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              Created:
              Updated:
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