Minecraft:Java Edition 21w06a

21w06a is the ninth Minecraft:snapshot for Minecraft:Java Edition 1.17, released on February 10, 2021,<ref>Template:Snap</ref> which adds new Minecraft:cave generation and increased the build height limit to 384.

Worlds created prior to this snapshot or after Minecraft:21w15a cannot be loaded and edited in this version without NBT editors, due to there being no upgrade path toward the expanded height limits in this snapshot. However, it is possible to use Minecraft:Combat Test snapshot worlds due to the Minecraft:data version exceeding that of the 1.17 snapshots.

Additions

File:21w06a Cross Section.jpg

World generation

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• Added new noise caves, which come in two types: "spaghetti" and "cheese" caves.
• Added flooded aquifer caves.
• The old "carver" cave generation still generates, combining with the new caves.

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• Long, narrow caves.
• Utilize Minecraft:noise generators for generation.
• Can form cave entrances when they intersect with land.

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• Utilize Minecraft:noise generators for generation.
• Often form caverns of various sizes.
• Can form cave entrances when they intersect with land.

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• Used to generate bodies of Minecraft:water in new caves.
• Currently only used below Y=31, meaning any noise caves between Y=31 and Y=63 are flooded with water. This is fixed in Minecraft:Java Edition 1.18 Experimental Snapshot 1.
• Minecraft:Magma blocks may generate at the bottom of these new water bodies, creating downward bubble columns.
• Replaces the old underwater cave carvers/canyons.
• Minecraft:Fish spawn in aquifers if it is under an Minecraft:ocean or Minecraft:river.

General

Minecraft:Data packs

• Added Template:Nbt and Template:Nbt to worldgen/noise_settings/*.json.

Changes

Blocks

Minecraft:Big dripleaf

• No longer stops tilting while sneaking on, jumping on, or even jumping off it.
• Now tilts quicker.
• Now tilts when hit with a projectile, instead of being broken.
• Can now be used with redstone.
  • Powering a dripleaf now prevents it from tilting down (except for projectiles).
  • Powering an already tilted dripleaf tilts it back up.
  • Unpowering a dripleaf down allows it to tilt down again.

Minecraft:Hanging roots

• Texture has been changed.

Minecraft:Lava

• No longer replaces air.

Minecraft:Small dripleaf

• Texture has been changed.

World generation

Minecraft:Chunks

• The Minecraft:Overworld now has a total height of 384 blocks.
  • The world has been extended 64 blocks up and 64 blocks down, which means it's now possible to build from layer -64 to layer 319 in the Overworld.
  • Ore placement below Y=0 is temporary, and underground lava does not generate properly yet.<ref>Template:Tweet</ref>

Minecraft:Mineshafts

• Mineshaft pieces no longer generate if they were fully floating in the air.
• Corridors now generate with (bark) Minecraft:wood pillars for support if needed.
• Cobwebs no longer generate floating without an adjacent block.

General

File:21w06a world selection warning.png

The warning message attached to old worlds.

File:116terrain117.png

1.16 world loaded in 21w06a by changing the level.dat

World selection menu

• Disabled the loading of old worlds temporarily.
  • This can be bypassed by setting the data version in level.dat to 2694 or higher. However, this may cause issues.

Trivia

• This snapshot marks the first time since Minecraft:12w07a, almost exactly 9 years prior, that the height limit was increased.
  • This is also the first time that the build limit has been increased downwards.