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21w10a is the thirteenth snapshot for Java Edition 1.17, released on March 10, 2021,[1] which adds lush caves and new deepslate variants.

Additions

Blocks

Cracked Deepslate Bricks
  • Added a cracked variation of deepslate bricks.
Cracked Deepslate Tiles
  • Added a cracked variation of deepslate tiles.
Deepslate Ore
  • Added the deepslate ore for copper, emerald and coal ore, but they will not generate in the world by default, they only have been added for use by creators of maps and data packs.
Infested Deepslate
  • An infested variant of deepslate.

World generation

Azalea Tree
Lush Caves biome
  • Currently the biome is only accessible in single-biome worlds.
  • Adaptive to the environment: every type of cave generation can be a lush cave.
  • Moss covers the floors and ceilings, along with moss carpets and grass on the floors.
  • Spore Blossoms grow from the ceiling and drip particles.
  • Contains clay pools where dripleaf plants grow out of them.
  • Contains azalea bushes (both variants).
  • Cave vines with glow berries grow from the ceiling and light up the caves.

Changes

Blocks

Cobbled Deepslate
  • The texture has been changed.
  • Can now be smelted back into deepslate.
Deepslate
  • Both the top and sides textures have been changed.
  • Deepslate can now be placed along any axis.
  • Textures in caves now generate with a random rotation.
Deepslate Bricks and Deepslate Tiles
  • Can now be crafted.
Coal ore, deepslate diamond ore, deepslate gold ore, deepslate iron ore, deepslate lapis ore, deepslate redstone ore, diamond ore, gold ore, iron ore
  • The textures of these ores have been changed.
    • Iron ore and deepslate iron ore no longer have streaks, better matching the appearance of other ores.
    • Diamond ore closer resembles deepslate diamond ore.

Items

Spyglass
  • The item model has been changed back to a dedicated texture.
    • Similar to tridents, the spyglass still uses a 3d model in the hand.
    • The texture is different from the original item texture.

Mobs

Slime
  • The maximum size that slimes can be summoned with is now 128.

World generation

Fossils
  • The fossils in the deepest part of the underground generate with Deepslate Diamond Ore instead of Coal Ore.
Ore distribution
21w10a approximate ore distribution

The new ore generation for 21w10a

Command format

/give
  • The give command can only give up to 100 stacks of items at a time (e.g. 6400 stone or 100 iron swords)

General

Game library updates
  • The game now runs using OpenGL 3.2 core profile.
Splashes
  • Changed the splash "OpenGL 2.1 (if supported)!" to "Now on OpenGL 3.2 core profile!"
Subtitles
  • Glow item frames have their own subtitles, no longer using the same subtitles as normal item frames.

Fixes

33 issues fixed
From released versions before 1.17
  • MC-29318 – Client misses inventory updates while player is manipulating items - causes invisible items.
  • MC-84121 – Shape of glow effect is based on mob's base layer.
  • MC-87019 – Only visible slots are updated clientside when you are inside an inventory.
  • MC-154094 – Lectern running /clear turns items into ghost items.
  • MC-175964 – Setblock command run by book in lectern to clear inventory run in command block causes ghost items.
  • MC-201316 – The /give command can create so many items that the game will freeze.
  • MC-210408/spawnpoint allows players to set their spawnpoint to out-of-bounds coordinates, which crashes the game when trying to respawn.
  • MC-214629 – FOV decreases when underwater regardless of FOV Effects accessibility setting.
  • MC-218139 – Inconsistent visual zooming within blocks and water in Spectator mode(in-game).
From the 1.17 development versions
  • MC-207818 – Placing a sign from the offhand closes the sign UI immediately.
  • MC-208301/clear does not properly affect the item on the mouse pointer after crafting it.
  • MC-211666 – Guardians attack invisible axolotls.
  • MC-212127 – Normal ink sac and glow ink sac are not grouped in the creative inventory.
  • MC-212144 – Subtitles refer to Glow Item Frame as "Item Frame".
  • MC-212168Ctrl + Pick Block doesn't copy block state "lit".
  • MC-212236 – Cannot visually critical-hit a glow squid (No sound/particles).
  • MC-212314 – Glow squid remains dark even if there is a light source block next to it.
  • MC-212325 – Glow Squid entity data (potion effects, custom name, ...) does not get saved.
  • MC-214781 – Lava does not generate at the very bottom of noise caves.
  • MC-214784 – Fossils can generate floating in caves.
  • MC-214836 – Water caves cause land to be excessively flooded.
  • MC-214844 – Bedrock can be exposed to the air at the very bottom of the new caves.
  • MC-214970 – Phantoms continously make too much flapping sounds.
  • MC-215194 – Structure blocks do not work below y=0.
  • MC-215838 – There is currently no way to craft deepslate tiles and deepslate bricks.
  • MC-215850 – Deepslate Tile Wall comes before Deepslate Brick Wall but Deepslate Bricks come before Deepslate Tiles in creative inventory.
  • MC-215939 – Emerald ore spawns in lower frequencies than it should above y=100.
  • MC-216136 – Polished deepslate slab isn't grouped with the other deepslate slabs in creative inventory.
  • MC-216363 – Crash upon replacing soul sand or magma with the other under a tall bubble column using /setblock.
  • MC-216735 – Stone Lapis Ore generating in Deepslate.
  • MC-216736 – Lava lakes generate exposed in caves.
  • MC-216765 – Coal ore can generate below Y=0 when attached to a fossil.
  • MC-216817 – Inconsistency: Cobbled deepslate cannot be smelted back into deepslate.

References

  1. "Minecraft Snapshot 21w10a" – Minecraft.net, March 10, 2021
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