Java Edition 21w06a

Minecraft 21w06a
Edition	Java Edition
Type	Snapshot
Release date	February 10, 2021
Snapshot for	1.17
Downloads	Client (.json) Server
Obfuscation maps	Client Server
Protocol version	0x4000000E
Data version	2694

21w06a is the ninth snapshot for Java Edition 1.17, released on February 10, 2021, which adds new cave generation and a new build height limit.

Worlds created prior to this snapshot cannot be loaded and edited in this version without NBT editors, due to there being no upgrade path towards the new height.

Additions

World generation

Caves

• Added aquifers and new noise caves, which come in two “flavors”: “spaghetti” and “cheese” caves.
• The old cave generation still generates, combining with the new caves.

Spaghetti caves

• Long noodle-like caves, sometimes wide like tagliatelle.
• Utilize noise generators for generation.
• Can form cave entrances when they intersect with land.

Cheese caves

• Utilize noise generators for generation.
• Like the holes in swiss cheese, often form caverns of various sizes.
• Can form cave entrances when they intersect with land.

Aquifers

• Used to generate bodies of water in new caves. Currently only used below Y=31, meaning any noise caves between the two heights are flooded with water. This will be fixed in a later snapshot.
• Magma blocks may generate at the bottom of these new water bodies, creating downward bubble columns.
• Replaces the old underwater cave carvers/canyons.
• Fish spawn in aquifers if it is under an ocean or river.

Mineshafts

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

Changes

Blocks

Big Dripleaf

• Will no longer stop tilting while sneaking on, jumping on, or even jumping off it.
• Will now tilt quicker.
• Now just tilt when hit with a projectile.
• Can now be used with redstone.
  • Powering a dripleaf will now prevent it from tilting down.
  • Powering an already tilted dripleaf will tilt it back up.
  • Powering a dripleaf down will allow it to tilt down again.
  • Powering a dripleaf does not prevent tilting because of projectiles.

Hanging Roots

• The texture has been changed.

Small Dripleaf

• The texture has been changed.

General

World

• The 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.
  • Due to this change, worlds created in older versions cannot be loaded in this snapshot.
  • Ore placement below Y=0 is temporary, and underground lava does not generate properly yet.

Trivia

• This is the first snapshot for the Caves & Cliffs Update in which no new items were added.
• This snapshot marks the first time since 12w07a, almost exactly 9 years prior, that the height limit was increased.

Fixes

2 issues fixed

From the 1.17 development versions

• MC-213813 – Small dripleaf can destroy any block.

From the previous development version

• MC-214346 – Big dripleaf can be broken with arrows in spawn protection.

Video

Video made by slicedlime on the gameplay changes:

Video made by slicedlime on the technical changes: