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  1. Minecraft: Java Edition
  2. MC-120596

Hopper don't pick up items under certain conditions

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    Details

    • Type: Bug
    • Status: Open
    • Resolution: Unresolved
    • Affects Version/s: Minecraft 1.12, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.12.1, Minecraft 1.12.2 Pre-Release 1, Minecraft 1.12.2 Pre-Release 2, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b, Minecraft 17w45a, Minecraft 17w45b, Minecraft 18w20b, Minecraft 1.13-pre1, Minecraft 1.13-pre2, Minecraft 1.13-pre3, Minecraft 1.13-pre4, Minecraft 1.13-pre6, Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13, Minecraft 1.13.2, Minecraft 18w48a, Minecraft 18w48b, Minecraft 18w49a, Minecraft 18w50a, Minecraft 19w02a, Minecraft 19w03c, Minecraft 19w04a, Minecraft 19w04b, Minecraft 19w05a, Minecraft 19w06a, Minecraft 19w07a, Minecraft 19w08b, 1.14.4, 19w37a, 1.15 Pre-release 1, 1.15.1, 1.15.2 Pre-Release 1, 1.15.2, 20w06a, 1.16.2 Release Candidate 1, 1.16.4 Pre-release 2
    • Fix Version/s: None
    • Labels:
      None
    • Confirmation Status:
      Confirmed
    • Category:
      Redstone
    • Mojang Priority:
      Low

      Description

      The cool down timer of hoppers is used for picking up and pushing out items.
      This leads to hoppers that push out items, to only pick up items every 8th game tick.
      If items happen to cross the hopper only outside of these ticks, the hopper might never pick up items, even though there are free slots in it.

      What I expected to happen was the hopper picking up items.

      What actually happened was the hopper not picking up items in certain cases.

      Ways to reproduce

      With hoppers

      (by Xavom)

      there's 4 hoppers in a loop on the top, and you should first power the block then put one item in each set of looping hoppers

      With hopper minecart


      The minecart is driving back and forth on a 9 block long track.
      In the center there is a hopper below the rail with some items in it pointing into another hopper that points back (pushing items back and forth between each other).
      Depending on when the minecart started driving, the hopper will not pick up items from it.
      Note that this is only the case when the hopper is pushing out items. If you break the second hopper it would pick up items fine.

      The test setup is attached as structure file. mc-120596.nbt

        Attachments

        1. 2017-09-10_01.54.40.png
          2017-09-10_01.54.40.png
          122 kB
        2. 2018-07-13_08.16.38.png
          2018-07-13_08.16.38.png
          518 kB
        3. mc-120596.nbt
          0.9 kB

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              Assignee:
              Unassigned Unassigned
              Reporter:
              panda4994 [Mojang] Panda
              Votes:
              24 Vote for this issue
              Watchers:
              19 Start watching this issue

                Dates

                Created:
                Updated:
                CHK: