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  1. Minecraft: Java Edition
  2. MC-79154

Hoppers occasionally duplicate items

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Minecraft 1.12.2 Pre-Release 1
    • Minecraft 1.8.3, Minecraft 1.8.8, Minecraft 15w45a, Minecraft 1.9, Minecraft 1.11.2, Minecraft 1.12, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.12.1
    • None
    • Confirmed

      Server duplicates items in hoppers. After a while, all hopper clocks are getting broken, because there is more than one item in it. I managed to duplicate diamond blocks.

      Server Console says:

      [13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:01:44] [Server thread/WARN]: Fetching addPacket for removed entity
[13:02:23] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2144ms behind, skipping 42 tick(s)

      Edit: I now caught it happening. A hopper speed up so fast, that even a comparator doesn't work anymore. I'm sure this leads to item duplication.

      Code analisys by theosib2 can be found in this comment.

        1. crash-2015-03-30_20.03.02-client.txt
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