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  1. Minecraft: Java Edition
  2. MC-51340

Certain blocks do not update when falling, placed or cloned next to a power source

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • Minecraft 14w11b, Minecraft 14w17a, Minecraft 14w18a, Minecraft 14w30b, Minecraft 14w30c, Minecraft 1.8, Minecraft 1.8.1-pre3, Minecraft 15w33b, Minecraft 15w33c, Minecraft 15w34a, Minecraft 1.10.2, Minecraft 16w42a, Minecraft 1.12 Pre-Release 7, 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 17w45b, Minecraft 17w46a, Minecraft 17w47a, Minecraft 17w47b, Minecraft 17w48a, Minecraft 18w01a, Minecraft 18w03b, Minecraft 18w05a, Minecraft 18w16a, Minecraft 18w22a, Minecraft 1.13-pre1, Minecraft 1.13-pre2, Minecraft 1.13-pre4, Minecraft 1.13-pre6, Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13, Minecraft 1.13.1-pre1, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 18w48a, Minecraft 18w48b, Minecraft 18w49a, Minecraft 19w03b, Minecraft 19w03c, Minecraft 19w04b, Minecraft 19w05a, Minecraft 19w06a, Minecraft 19w07a, Minecraft 19w12b, Minecraft 19w13b, Minecraft 1.14.1, Minecraft 1.14.2 Pre-Release 2, Minecraft 1.14.2 Pre-Release 3, 1.15.2 Pre-Release 1, 1.15.2, 20w06a, 20w09a, 20w12a, 20w13a, 20w13b, 20w14a, 20w17a, 20w19a, 1.16 Pre-release 5, 1.16.1, 1.16.2 Pre-release 3, 1.16.4, 20w48a, 20w49a, 20w51a, 21w03a, 1.16.5, 1.17 Pre-release 3, 1.17.1, 1.18.2, 1.19.1 Pre-release 5, 1.20.2
    • Confirmed
    • Commands
    • Low
    • Platform

      The bug

      When certain block entities such as a dropper/dispenser or a command block that contain NBT data for items or a command is either placed manually on a power source or cloned on a power source it will receive power because a repeater gets power from the side of it but the dispenser will not place/drop anything and the command block will not run the command.

      How to reproduce

      1. Place down a dispenser or dropper or command block
      2. Put items or a command into the block, depending what it is
      3. Control and middle-click the block to get the block with NBT data
      4. Place this on a power source such as a redstone torch or a redstone block
        → It should run the command or drop/place something but it does not

      Note: this also affects note blocks, they won't play a note until they received a block update.

      Test command for falling block, insert into a command block and trigger:

      summon falling_block ~ ~2 ~ {
	BlockState:{Name:"minecraft:stone"},
	Time:1s,
	Passengers:
	[
		{
			id:"falling_block",
			BlockState:{Name:"minecraft:redstone_block"},
			Time:1s,
			Passengers:
			[
				{
					id:"falling_block",
					BlockState:{Name:"minecraft:command_block"},
					TileEntityData:{Command:"say Test"},
					Time:1s
				}
			]
		}
	]
}

      Related issue

      MC-31100 when using /setblock to place the block it does not update (and more)

      Code analysis

      Code analysis by marcono1234 can be found in this comment on bug report MC-18631.

            Unassigned Unassigned
            LapisDemon Meri Diana
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            20 Vote for this issue
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              Created:
              Updated:
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