Java Edition 21w11a

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 "title": "Minecraft 21w11a",
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 "field": "''(link to Java Edition article, displayed as Java Edition)''",
 "label": "(link to Edition article, displayed as Edition)"
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 {
 "field": "March 17, 2021",
 "label": "Release date"
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 {
 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
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 {
 "field": "(link to Java Edition 1.17 article, displayed as 1.17)",
 "label": "Snapshot for"
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 "field": "[https://piston-data.mojang.com/v1/objects/07ad8b23e33d195fd897133c9c0e35d7fa1593eb/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/256f291742441e215cf6743e4aba6c994b292550/21w11a.json .json])<br />[https://piston-data.mojang.com/v1/objects/c828957ad249138129ccbc8749bfd14f01d96a4b/server.jar Server]",
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 "label": "(link to Obfuscation map article, displayed as Obfuscation maps)"
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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741843<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000013",
 "label": "(link to Protocol version article, displayed as Protocol version)"
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 "field": "2703",
 "label": "(link to Data version article, displayed as Data version)"
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 "field": "7",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Resource pack format)</span>"
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 "field": "7",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Data pack format)</span>"
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w10a|◄  21w10a]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w11a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w13a| 21w13a ►]]\n</td>\n</tr>\n</table>"
}

21w11a is the fourteenth snapshot for Java Edition 1.17 released on March 17, 2021,^[1] which fixes numerous bugs, many of which relate to textures and rendering issues as well as adds new mechanics related to copper.

Controls

• Added  +  shortcut to generate and persist performance metrics from in-game, similar to /debug.
  • Metrics are saved in .minecraft/debug/profiling/<timestamp>.zip.

Particles

• Added the electric_spark, scrape, wax_off, and wax_on particles.

Tags

• Added the cluster_max_harvestables item tag.
  • Contains all pickaxes.

Amethyst cluster

• Breaking by hand, piston, or other means now drops 2 amethyst shards instead of dropping none.
• Breaking with any pickaxe can now be used to drop 4 amethyst shards instead of an iron pickaxe or higher.

Azalea

• Can now be used as fuel in a furnace.

Big dripleaf

• Breaking the stem now drops the block.
• Now can be fertilized with bone meal on the stem to make the dripleaf grow.

Block of copper, cut copper, and variants

• Honeycomb can now be used to wax them, to match Bedrock Edition.
  • Yellow particles are formed when waxing the block.
• Using a dispenser with honeycomb waxes them, matching Bedrock Edition.
• Axes can now be used to scrape off wax and oxidation (one stage at a time).
  • White particles are formed when scraping off wax from the block.
• Lightning now may clean oxidation, reverting the oxidation process by one or several stages.
  • Chances of cleaning and number of reverted stages are higher the closer to the struck block.
• Waxed copper blocks can be crafted into 4 copper ingots, to match Bedrock Edition.

Brewing stand

• Changed potion icon in the brewing stand GUI to reflect the new bottle texture in the Texture Update.^[2]
• Removed some stray pixels from the GUI texture.

Cauldron

• Lava buckets and powder snow buckets can now be emptied in the respective filled cauldrons.

Cave vines

• Renamed the parts from "cave vines head" and "cave vines body" to "cave vines" and "cave vines plant", respectively.
  • The IDs have also changed.
• Now all parts give a light level of 14.
  • Previously, only the bottom-most part gave level 14; others gave only 10.
• Now slow down the player.
• Can now be climbed.

👁 Image
End gateway block

• Particle field has been shrunk to its pre-21w10a size.

👁 Image
End portal block

• Particle field has been shrunk to its pre-21w10a size.

Gilded blackstone

• The texture has changed.

Glow lichen

• Bone meal can no longer be used on it if it has no blocks to spread to.
• Can now be used on a composter.

Grass block

• Changed part of the dirt of the side texture of snowy grass to match regular grass.^[3]

Hanging roots

• Now renders randomly offset from the center.
• Removing the support block for it no longer allows it to float.

Lava

• Again replaces air below Y=-55.

Lectern

• Slightly shrunk top part to prevent z-fighting with fire.^[4]

Lightning rod

• Can now be waterlogged.
• Now turns completely white when struck by lightning.
  • Has a new block state, "powered", used to determine whether the rod turns completely white when struck by lightning.
• Now emits particles when in contact with rain.

Moss block

• Can be combined with cobblestone or stone bricks to make the mossy versions of those blocks.
  • Vines can still be used, in addition to moss blocks.
• In addition to axes,^[5] hoes are now an appropriate tool to collect it.

Pumpkin

• Changed one pixel on the pumpkin's top texture to remove the possibility for a small swastika to be displayed.^[6]

Rooted dirt

• Using bone meal on any side grows hanging roots underneath.

Signs

• Changed the textures of acacia, birch, dark oak, jungle, oak, and spruce signs to reflect new textures in the Texture Update.

Small dripleaf

• The facing direction is now determined by which direction the player is facing when placing it.

Smoker

• Changed the top texture of the smoker.

Spore blossom

• Removing the support block for it no longer allows it to float.

Tinted glass

• No longer causes suffocation.
• Mobs can no longer spawn on top of it.

Jungle doors

• Changed the texture of the jungle door item to reflect the block texture in the Texture Update.^[7]

Spectral arrows

• Fired spectral arrows are now entirely golden to reflect the item texture in the Texture Update.^[8]

Sugar cane

• Changed the texture of the sugar cane item to better reflect biome tinting added in 1.7.2.^[9]

Cats

• Changed the texture of the siamese cat type, mostly brightening it.

Guardian and elder guardian

• Removed some stray pixels from the texture file.

Villagers and zombie villagers

• Moved the librarian top overlay texture to correct side of its torso.^[10]

Paintings

• Changed the back texture to reflect the planks texture in the Texture Update.

Caves

• Tweaked the cave sizes.

Lush caves

• Reduced the amount of floating water in lush caves.

Ores

• Slightly increased the frequency of diamond ore blobs.
• If any ore replaces tuff, it is now deepslate ore.

Freezing

• Frozen hearts now have a different texture in Hardcore mode to reflect the regular heart texture.

Spectator mode

• It is now possible to see while inside lava and powder snow.

Subtitles

• Added subtitles for amethyst blocks chiming.
• Added subtitles for waxing and removing wax from copper blocks.
  • These are "Wax on" and "Wax off", but are not triggered in-game.^[11]
• Changed the subtitles for stripping logs and wood from "Axe scrapes" to "Axe strips".
  • "Axe scrapes" is now used for copper blocks. However, it is not triggered in-game.^[11]

Tags

• Added cave vines and cave vines plant to the climbable block tag.
• Added tuff to the deepslate_ore_replaceables block tag.
• Added tinted glass to the impermeable block tag.
• Removed tuff from the stone_ore_replaceables block tag.

127 issues fixed

From released versions before 1.17

• MC-1483 – Snow covered grass/podzol/mycelium block side texture does not match original block.
• MC-9591 – Players are able to create ghost lily pads.
• MC-12363 – Lava / water / powder snow bucket desync when using it while rapidly turning.
• MC-70850 – False negatives during occlusion culling.
• MC-71530 – Spectators can't see through lava.
• MC-86645 – Scroll bar goes higher than chat overlay.
• MC-145501 – Librarian and zombie librarian torso top texture is incorrect.
• MC-150054 – Spectral arrow texture on item and entity aren't consistent.
• MC-150784 – Brewing Stand bottle outline incorrect.
• MC-154006 – Overworld wood signs use the outdated wood texture on all sides.
• MC-160195 – Jungle door inventory texture is outdated.
• MC-160388 – Painting back texture has not been updated with the texture update.
• MC-169717 – Blocks in recipe book groups are rendered in front of item tooltips.
• MC-195806 – Smoker's top and bottom textures have inconsistently colored pixels.
• MC-197561 – Carved pumpkins and jack o'lanterns create swastikas.
• MC-197883 – Jigsaw Structures causing DataFixer spam.
• MC-198805 – Floating pixel in the tailfin of a guardian/elder guardian.
• MC-202186 – Houses in Zombie Villages disappear when spawned using /locate.
• MC-202760 – area_effect_cloud does not enforce a maximum radius.
• MC-211513 – Trident returning to owner not in the same world can cause permanent player kick.
• MC-212123 – Player lighting is inconsistent in the inventory and appears darker on the front.
• MC-214568 – Setting a lectern on fire causes z-fighting.
• MC-216227 – Sugar cane item texture is no longer accurate from 13w36a forward.

From the 1.17 development versions

• MC-203554 – block.amethyst_block.chime has no subtitle.
• MC-203561 – Amethyst crystal cluster drops items when block is moved directly by a piston without actually breaking the block.
• MC-203623 – Inconsistency: Breaking amethyst crystals with hands doesn't drop the item, but breaking the block they are placed on drops them.
• MC-203676 – Tinted Glass suffocates entities inside of it.
• MC-203753 – Spyglass use statistic never increases.
• MC-203918 – Mobs can spawn on tinted glass.
• MC-204016 – When filling a lava/powder snow cauldron with lava/powder snow, it is placed on the ground instead of in the cauldron.
• MC-204115 – Pushing an amethyst cluster off of a block with a 1-tick pulse using a sticky piston doesn't drop any items.
• MC-204862 – Tinted glass is not included in the impermeable tag.
• MC-205913 – Lightning rod can spawn skeleton horses with skeletons.
• MC-206588 – Blocks dripstone can be attached to are inconsistent.
• MC-206787 – World Border is rendered upside down.
• MC-206805 – World border texture moves up and down with the player.
• MC-207557 – Frozen hearts in hardcore mode look identical to frozen hearts in survival mode.
• MC-208295 – Moving water with a piston and amethyst cluster.
• MC-212226 – Bone Meal can still be used on a Glow Lichen when it is unable to grow.
• MC-212410 – Cannot compost glow lichen.
• MC-213269 – Waxed Copper Block cannot be crafted back into ingots.
• MC-213271 – Parity issue: Copper blocks cannot be waxed by either using honeycomb items on them or using dispensers with honeycombs.
• MC-213583 – Crash upon importing world generation settings with over 256 layers.
• MC-213743 – Spectators can't see through powder snow.
• MC-213764 – Removing the block supporting a spore blossom allows the spore blossom to float.
• MC-213765 – Cave vine blocks are inconsistent in ID from other similar blocks.
• MC-213768 – Removing the support block for hanging roots allows it to float.
• MC-213778 – Cave vines cannot be climbed.
• MC-213782 – Cave vines do not slow you down like other vines.
• MC-213798 – Cave vines head and body emit different light levels.
• MC-213816 – Hanging roots don't get destroyed by flowing water.
• MC-213886 – Bone meal cannot be used on dripleaf stems.
• MC-213911 – Cave vines body and cave vines head share the same name.
• MC-213980 – Moss appropriate tool is axe rather than hoe.
• MC-214290 – Crash upon importing world generation settings with a layer that is less than 0 blocks high.
• MC-214780 – It is not possible to create a superflat world with over 256 layers.
• MC-214868 – Big dripleaf won't drop the item if the top is underwater.
• MC-214951 – Superflat worlds start generating at negative coordinates, causing a dark horizon.
• MC-215036 – Snow layers in "Snowy Kingdom" superflat preset generate 64 blocks above the ground.
• MC-215384 – Azaleas cannot be used as a fuel.
• MC-215417 – Sky going dark y level ignores data pack dimension y axis limits (minecraft:overworld effects).
• MC-216018 – Redstone Ready and Water World presets have the default spawn point at wrong Y-level.
• MC-216134 – Gilded blackstone texture does not match the new side texture of blackstone.
• MC-216184 – Player takes no fall damage on blocks above Y=316.
• MC-216737 – When replacing tuff, ores still generate with a "stone" background below Y=0.
• MC-216945 – Teams become dysfunctional when any entity leaves the team.
• MC-216965 – Flat "slices" of terrain generating in cracks.
• MC-217303 – Potential optimization target in DepthBasedReplacingBaseStoneSource.
• MC-217546 – stat.fallOneCm is not updated when falling onto a block above Y=316.
• MC-217802 – Some blocks generate at wrong Y height in a superflat world.

From the previous development version

• MC-218587 – Lightning rod still can't be waterlogged.
• MC-218594 – Debug chunk borders don't render properly.
• MC-218596 – Debug pie is blacked out.
• MC-218597 – Water has no fog anymore.
• MC-218603 – Screen turns dark grey when switching dimension.
• MC-218604 – Hanging roots can generate hanging on other hanging roots, making them float.
• MC-218609 – Mipmapping causes some block faces to become too dark.
• MC-218610 – Banners are unimpacted by light levels.
• MC-218626 – Cannot enchant items.
• MC-218633 – Smooth lighting has brighter outlines.
• MC-218635 – With fast graphics, the freezing overlay renders black, and covers the whole screen black in first person.
• MC-218640 – Broken spyglass overlay on fast graphics.
• MC-218641 – Red vignette shown when outside the world border is too intense.
• MC-218645 – The carved pumpkin overlay turns the screen completely black when using fast graphics.
• MC-218652 – The green nausea overlay no longer renders.
• MC-218653 – Glowing effect no longer changes to team color.
• MC-218655 – Floating water generates excessively in lush caves.
• MC-218660 – The nether portal overlay no longer renders, whilst using fast graphics.
• MC-218695 – Shulkers do not flash red when hurt or killed.
• MC-218712 – Debug pie has purple box when moving an enchanted item.
• MC-218713 – Right clicking to open alternate recipes does not show the recipes.
• MC-218729 – Noise cave entrances cause unnatural, smooth edges in terrain.
• MC-218734 – Caves generate with very blocky areas.
• MC-218748 – At sunset, a blue line appears in the northern and southern skies.
• MC-218753 – Ambient occlusion of the player seen in the survival inventory has changed.
• MC-218793 – Two white lines appear on the Mojang loading screen.
• MC-218817 – Cave Vines can generate without supporting blocks.
• MC-218825 – M1 ARM Macs crash when using Fabulous Graphics mode as was the case in older versions, but no lack of support warning is shown.
• MC-218830 – World border is white.
• MC-218834 – You can see block hitboxes very clearly under powder snow/lava.
• MC-218845 – Mojang logo screen flashes blue before changing to red.
• MC-218852 – World border is occasionally shown as a solid color upon being loaded.
• MC-218877 – The red flash when a mob is hurt/killed appears to be slightly dimmed.
• MC-218881 – When selecting text in the end, the sky gets highlighted.
• MC-218911 – The background of hover-event text becomes blue when text is selected in an anvil or chat.
• MC-218945 – Spyglass has a gradient effect while freezing.
• MC-218979 – Cave ceilings and floors sometimes too flat or blocky.
• MC-218988 – Fire is rendered dark in the player/horse/llama UI.
• MC-218990 – Transparency buffers start with blue background instead of empty background.
• MC-219002 – The wither's wither armor has a blue aura around it.
• MC-219006 – The background opacity of subtitles and chat, are affected by a potion effect UI fading out.
• MC-219014 – Charged creeper layer makes clouds and entities invisible.
• MC-219036 – World border is shown as a solid color when picking up items or experience orbs.
• MC-219039 – World border does not render when below the world.
• MC-219049 – Reloading resource packs no longer shows the progress bar while the transparent background is shown.
• MC-219105 – Entity hitboxes can be seen whilst inside of powder snow/lava.
• MC-219108 – Chat scroll bar is offset.
• MC-219111 – Social interactions scroll bar appears broken.
• MC-219126 – Spyglass allows looking through blocks.
• MC-219180 – Slime blocks, honey blocks, stained glass, and ice are fully lit when moved by pistons.
• MC-219208 – Using enchanted items allows looking through blocks.
• MC-219212 – Entity shadows can be seen whilst inside of powder snow/lava.
• MC-219224 – The background opacity of command syntax help is affected when highlighting text.
• MC-219278 – Being inside of a block no longer shows the block texture.
• MC-219281 – Dying ender dragon is rendered too bright.
• MC-219392 – Lead/fishing line is no longer affected by the fog from powder snow/lava.
• MC-219597 – End portal and end gateway textures expand as the player travels further from the block.

• This version has the same data version as Combat Test 7b, even though these versions should not be compatible with each other.
• 21w11a held the record for the largest number of bug fixes in a single snapshot, and the second highest of any development version, at 127. This record was beaten by 24w33a.