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  1. Minecraft: Java Edition
  2. MC-107103

Trying to interact with entity 3 or more blocks away without seeing its eyes only interacts client-side


    • Icon: Bug Bug
    • Resolution: Fixed
    • 20w21a
    • Minecraft 1.10.2, Minecraft 16w36a, Minecraft 16w38a, Minecraft 16w39a, Minecraft 16w39b, Minecraft 16w39c, Minecraft 16w40a, Minecraft 16w41a, Minecraft 16w42a, Minecraft 16w43a, Minecraft 16w44a, Minecraft 1.11 Pre-Release 1, Minecraft 1.11, Minecraft 16w50a, Minecraft 1.11.1, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 17w13b, Minecraft 17w15a, Minecraft 17w16b, Minecraft 17w17a, Minecraft 17w17b, Minecraft 17w18a, Minecraft 1.12 Pre-Release 2, Minecraft 1.12 Pre-Release 3, Minecraft 1.12 Pre-Release 4, Minecraft 1.12 Pre-Release 5, Minecraft 1.12 Pre-Release 6, Minecraft 1.12 Pre-Release 7, Minecraft 1.12, 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 17w45b, Minecraft 17w46a, Minecraft 17w48a, Minecraft 18w01a, Minecraft 18w03b, Minecraft 18w15a, Minecraft 18w22a, Minecraft 18w22c, Minecraft 1.13-pre1, Minecraft 1.13-pre2, Minecraft 1.13-pre3, Minecraft 1.13-pre5, Minecraft 1.13-pre6, Minecraft 1.13, Minecraft 1.13.1, 1.14.4, 1.15.1, 20w06a, 20w07a
    • Confirmed
    • Entities

      The bug

      Trying to interact with an entity which is 3 or more blocks away without seeing its eyes only causes the interaction to happen only client-side. This can lead to ghost items or other weird behavior.

      Example interactions

      Interaction Result
      Using a Name tag on a mob The mob is named for client, but it can despawn, commands won't find it by the name, and the name disappears after a re-log. The name tag disappears from the inventory (survival) and returns back if you update the slot it was in
      Using a Flint and Steel on a creeper Sound of igniting the entity
      Milking a cow or a mooshroom (MC-94008) Ghost buckets of milk that become empty buckets if you update them
      Shearing a mooshroom Mooshroom disappears until you re-log in
      Trying to ride a horse / llama Player is only rotated

      How to reproduce (horse)

      1. Summon a horse
      2. Make sure you are three or more blocks away from it and that you cannot see its eyes
      3. Right click the horse
        → The rotation of the horse is applied to you but you did not mount the horse

      How to reproduce (name tag)

      Creepers in bug.png represent 3 cases (from left to right) in which the mob is behind (glass) blocks.

      • In the 1st and the 2nd case you should stand on sandstone blocks or top of sandstone stairs to reproduce the bug.
      • In the 3rd case you should be at least 2.625 blocks higher than the mob (0.625 = 6 snow layers) and 1 block away from it

      Code analysis

      Based on 1.11.2 decompiled using MCP 9.35 rc1

      The method net.minecraft.network.NetHandlerPlayServer.processUseEntity(CPacketUseEntity) requires the player to see the eyes of the entity (method EntityLivingBase.canEntityBeSeen(Entity)). This check might make no sense because you are not always trying to interact with the head of an entity.

            cojomax99 [Mojang] Cory Scheviak
            SunCat [Mod] SunCat
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            14 Start watching this issue