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MC-18631

Some redstone components (block entities) do not update themselves when placed

Certain block entities, when newly placed next to a power source, won't activate until they receive a block update.

Steps To Reproduce:
1. Place a command block to where it will be powered as soon as it is placed.
2. Type a command into the command block, e.g.: "say test".
> Notice the command block won't output "test" although it's powered.
3. Cause a block update next to the command block.
> Notice the command block now outputs "test".

This also occurs with dispensers, droppers, and note blocks.

See also:
MC-51340, it also happens if you got certain block entities with NBT data (e.g. a command block with an inserted command) and place that manually next to a power source, as well as
MC-31100 if you setblock certain block entities with NBT data where they would get powered, as well as
MC-80901 as falling block.


Code analysis by @unknown in this comment.

Linked issues

Attachments

Comments 21

Please attach screenshots.

Confirmed. Attached screenshots.

Sorry for not adding screenshots, i wasn't sure of a good way of showing it in a screenshot.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Updated

11 more comments

Confirmed for 1.12 pre-5.

But wouldn't it be advisable to resolve MC-31100, MC-51340 and MC-80901 as duplicate of this bugpost?
Unless there's a reason to not bundle them together.
I got test setups for each one of them like the OP's provided test setup, but it's more or less the same.

Confirmed for 1.12 pre-7.

Confirmed for 1.12 release.

(@unknown Thank you also here 🙂)

Ticket is yours now, @unknown

Merging with MC-51340 as it's the same cause.

Austin

Meri Diana

(Unassigned)

Confirmed

block-entity, block-update, command_block, redstone

Snapshot 13w25c, Minecraft 1.6.2, Minecraft 14w20b, Minecraft 1.8-pre1, Minecraft 1.8.3, ..., Minecraft 1.12.2 Pre-Release 1, Minecraft 1.12.2 Pre-Release 2, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b

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