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Java Edition:Invalid Wall Configuration

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Walls have several rules on how they are intended to connect. Throughout Minecraft history, there have been many bugs and changes that have allowed currently unavailable configurations of walls.

The cobblestone and mossy cobblestone walls were the first two walls added in 12w34a (1.4 snapshot). Walls were intended to connect to one another and to other adjacent full blocks. New variants of walls were added in 18w43a (1.14 snapshot) and new ones have continued to release in subsequent versions. Walls were majorly updated in 20w06a (1.16 snapshot) that added a new low vs tall block state for each of its connections. This allowed vertical stacks of walls to have no gaps, and pillars are only added to a wall when a support block rests on top or a pillar is connecting to a block. Older walls will not gain these changes unless they receive a block update.

Obtaining

Pre-20w06a Wall

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String On Top without Post

In 20w06a, placing string on top of a wall did not create a post. This was reported as a bug, including the description "used to be used as an invisible way to force a pillar."[1] This bug was fixed in the next snapshot, 20w07a.

Soul Torch or Soul Lantern On Top without Post

In 20w06a, a bug caused soul lanterns and soul torches to not create a wall pillar when placed on top of wall.[2] This was unlike the normal torch and lantern which did create pillars. The bug was fixed in the very next snapshot, 20w07a.

Wall Disconnected from Soul Sand

From 18w48a (1.14 snapshot) to 20w11a (1.16 snapshot), walls did not connect to soul sand.[3]

Pillar Inside Wall

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MC-170846

Wall Disconnected from Glass Plane or Iron Bar

In 20w15a, walls were changed so that they connect to glass panes and iron bars. From the addition of walls to 20w14a (including 20w14∞), walls could be placed next to glass panes or iron bars without them connecting.

Sea Pickle On Top without Post

In 20w15a, walls were changed so any sea pickle on top will create a pillar. From 20w06a to 20w14a (including 20w14∞), sea pickles could be placed on top of a wall without creating a pillar.

Pressure Plate or Banner On Top without Post

In 20w17a, walls were changed so any pressure plate or banner will create a pillar. From 20w06a to 20w16a, these could be placed on top of a wall without creating a pillar.

Cactus Flower On Top without Post

From 25w06a to 25w08a (1.21 snapshots), cactus flowers on walls do not create pillars. Starting in 25w09a, cactus flowers do create pillars when put on top of walls.

Generic Multiblock Methods

In addition to wall specific methods, there are several powerful methods that are used to make many multiblock discontinued features that also work on walls. Update suppression, update skipping, the less_interaction_updates vote in 23w13a_or_b, chunk savestating, and chunk regeneration can all be used to get discontinued wall configurations.

See also

References

  1. ↑ MC-170939. bugs.mojang.com.
  2. ↑ MC-170862. bugs.mojang.com.
  3. ↑ MC-172517, incorrect fix version listed. Correct end version found through testing.


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