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MC-176644

Observers don't trigger when a fence connects to a newly grown tree

The bug

A fence connecting to an adjacent block placed by a player or moved in by a piston causes the observer to trigger, a tree growing besides a fence does not, even though it connects.

To reproduce

  1. Place a sapling

  2. Place a fence next to it

  3. Place an observer facing the fence

  4. Place a redstone lamp or a piston behind the observer

  5. Bonemeal the sapling
    → ❌ When the tree grows, the observer will not trigger the lamp / the piston

Video

[media]

Linked issues

Attachments

Comments

migrated

Did some more testing with other blocks.

The following show the same beahviour:

  • Walls

  • Iron Bars

  • Glass Panes

  • Bells

  • Leaves

migrated

Panda4994

Confirmed

Redstone

1.15.2, 20w13b

20w14a

Retrieved