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  1. Minecraft (Bedrock codebase)
  2. MCPE-163651

Comparators respond incorrectly to side + back input from redstone dust connected to a common power source


    • Icon: Bug Bug
    • Resolution: Fixed
    • Preview, 1.19.70
    • 1.19.40, Preview, 1.19.41, 1.19.50, 1.19.51, 1.19.63
    • None
    • Confirmed
    • Multiple
    • 922512

      Steps to reproduce

      1. Place a comparator and a line/web of redstone dust that connects to the back and side inputs of the comparator, and a separate redstone dust line at its output.
      2. Place or activate a redstone power source in a position that makes the redstone power level at both comparator inputs be the same.
      3. Repeat this setup each direction and with the comparator in normal and subtract modes.
      4. Repeat the setup again but add a second comparator pointing the same direction but farther from the power source such that the redstone dust input at its back is at a higher level than the input at its side.

      Expected result

      The comparators always calculate the correct output.

      Observed result

      Half of the comparators calculate incorrect ouputs, and they go wrong in different ways depending on whether they are aligned with the X or Z axis.

      Subtract mode on comparators does not function when the main input and side input of the comparator are connected redstone, and when the comparator is facing east or west. The same is when it is not in subtract mode.

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        3. bug5.jpg
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        4. bug6.jpg
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        5. image_2022-10-25_215522934.png
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        6. image-2022-10-26-19-12-36-061.png
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        7. image-2022-12-06-10-07-03-910.png
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        9. Minecraft 10_26_2022 8_00_17 AM.png
          Minecraft 10_26_2022 8_00_17 AM.png
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        10. Minecraft 10_26_2022 8_44_23 AM.png
          Minecraft 10_26_2022 8_44_23 AM.png
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        11. Minecraft 10_26_2022 8_44_33 AM.png
          Minecraft 10_26_2022 8_44_33 AM.png
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        12. Minecraft 11_3_2022 12_46_19 AM-1.png
          Minecraft 11_3_2022 12_46_19 AM-1.png
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        13. Same Input.jpg
          Same Input.jpg
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        14. Same Input with Buffer.jpg
          Same Input with Buffer.jpg
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        15. Separate Inputs.jpg
          Separate Inputs.jpg
          4.24 MB
        16. Separate Inputs (No Subtraction).jpg
          Separate Inputs (No Subtraction).jpg
          2.22 MB
        17. Separate Inputs with Buffer.jpg
          Separate Inputs with Buffer.jpg
          1.19 MB

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