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{{Infobox version
|title=Minecraft 21w11a
|image=21w11a.jpg
|image2=Java Edition 21w11a.png
|edition=Java
|type=Snapshot
|date=March 17, 2021
|jsonhash=256f291742441e215cf6743e4aba6c994b292550
|clienthash=07ad8b23e33d195fd897133c9c0e35d7fa1593eb
|clientmap=e8f9be9094ea120eabed0030f997c51da6853793
|serverhash=c828957ad249138129ccbc8749bfd14f01d96a4b
|servermap=cf412c14df5bb5c3dce38bc7f19169c027ac045a
|parent=1.17
|prevparent=1.16.5
|prev=21w10a
|next=21w13a
|nextparent=1.17.1
}}<onlyinclude>

'''21w11a''' is the fourteenth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.17]] released on March 17, 2021,<ref>{{snap|21w11a|March 17, 2021}}</ref> which fixes numerous bugs, many of which relate to textures and rendering issues as well as adds new mechanics related to [[Minecraft:copper]].

== Additions ==
=== General ===
'''[[Minecraft:Controls]]'''
* Added {{key|F3+L}} shortcut to generate and persist performance metrics from in-game, similar to {{cmd|debug}}.
** Metrics are saved in <samp>[[Minecraft:.minecraft]]/debug/profiling/<''timestamp''>.zip</samp>.

'''[[Minecraft:Particles (Java Edition)|Particles]]'''
* Added the {{cd|electric_spark|scrape|wax_off|wax_on|d=and}} particles.

'''[[Minecraft:Tag]]s'''
* Added the <code>cluster_max_harvestables</code> item tag.
** Contains all pickaxes.

== Changes ==
=== Blocks ===
'''[[Minecraft:Amethyst cluster]]'''
* Breaking by hand, [[Minecraft:piston]], or other means now drops 2 [[Minecraft:amethyst shard]]s instead of dropping none.
* Breaking with any pickaxe can now be used to drop 4 amethyst shards instead of an iron pickaxe or higher.

'''[[Minecraft:Azalea]]'''
* Can now be used as [[Minecraft:fuel]] in a [[Minecraft:furnace]].

'''[[Minecraft:Big dripleaf]]'''
* Breaking the stem now drops the block.
* Now can be fertilized with [[Minecraft:bone meal]] on the stem to make the dripleaf grow.

'''[[Minecraft:Block of copper]], [[Minecraft:cut copper]], and variants'''
* [[Minecraft:Honeycomb]] can now be {{Control|used}} to wax them, to match {{BE}}.
** Yellow particles are formed when waxing the block.
* Using a [[Minecraft:dispenser]] with honeycomb waxes them, matching ''Bedrock Edition''.
* [[Minecraft:Axe]]s can now be {{Control|used}} to scrape off wax and oxidation (one stage at a time).
** White particles are formed when scraping off wax from the block.
* [[Minecraft: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 [[Minecraft:copper ingot]]s, to match ''Bedrock Edition''.

'''[[Minecraft:Brewing stand]]'''
* Changed potion icon in the brewing stand GUI to reflect the new bottle texture in the [[Minecraft:Texture Update]].<ref>{{bug|MC-150784}}</ref>
* Removed some stray pixels from the GUI texture.

'''[[Minecraft:Cauldron]]'''
* [[Minecraft:Lava bucket]]s and [[Minecraft:powder snow bucket]]s can now be emptied in the respective filled cauldrons.

'''[[Minecraft: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 [[Minecraft: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.

'''[[File:End Gateway JE5.gif|32px]] [[Minecraft:End Gateway (block)|End gateway block]]'''
* Particle field has been shrunk to its pre-21w10a size.

'''[[File:End Portal JE6.gif|32px]] [[Minecraft:End Portal (block)|End portal block]]'''
* Particle field has been shrunk to its pre-21w10a size.

'''[[Minecraft:Gilded blackstone]]'''
* The texture has changed.

'''[[Minecraft:Glow lichen]]'''
* [[Minecraft:Bone meal]] can no longer be used on it if it has no blocks to spread to.
* Can now be used on a [[Minecraft:composter]].

'''[[Minecraft:Grass block]]'''
* Changed part of the dirt of the side texture of snowy grass to match regular grass.<ref>{{bug|MC-1483}}</ref>

'''[[Minecraft:Hanging roots]]'''
* Now renders randomly offset from the center.
* Removing the support block for it no longer allows it to float.

'''[[Minecraft:Lava]]'''
* Again replaces air below Y=-55.

'''[[Minecraft:Lectern]]'''
* Slightly shrunk top part to prevent z-fighting with [[Minecraft:fire]].<ref>{{bug|MC-214568}}</ref>

'''[[Minecraft:Lightning rod]]'''
* Can now be [[Minecraft:waterlogged]].
* Now turns completely white when struck by [[Minecraft: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.

'''[[Minecraft:Moss block]]'''
* Can be combined with [[Minecraft:cobblestone]] or [[Minecraft:stone bricks]] to make the mossy versions of those blocks.
** [[Minecraft:Vines]] can still be used, in addition to moss blocks.
* In addition to [[Minecraft:axe]]s,<ref>{{bug|MC-219960}}</ref> [[Minecraft:hoe]]s are now an appropriate tool to collect it.

'''[[Minecraft:Pumpkin]]'''
* Changed one pixel on the pumpkin's top texture to remove the possibility for a small [[Minecraft:wikipedia:Swastika|swastika]] to be displayed.<ref>{{bug|MC-197561}}</ref>

'''[[Minecraft:Rooted dirt]]'''
* {{Control|Using}} [[Minecraft:bone meal]] on any side grows [[Minecraft:hanging roots]] underneath.

'''[[Minecraft:Sign]]s'''
* Changed the textures of acacia, birch, dark oak, jungle, oak, and spruce signs to reflect new textures in the [[Minecraft:Texture Update]].

'''[[Minecraft:Small dripleaf]]'''
* The facing direction is now determined by which direction the player is facing when placing it.

'''[[Minecraft:Smoker]]'''
* Changed the top texture of the smoker.

'''[[Minecraft:Spore blossom]]'''
* Removing the support block for it no longer allows it to float.

'''[[Minecraft:Tinted glass]]'''
* No longer causes [[Minecraft:suffocation]].
* Mobs can no longer spawn on top of it.

=== Items ===
'''[[Minecraft:Jungle door]]s'''
* Changed the texture of the jungle door item to reflect the block texture in the Texture Update.<ref>{{bug|MC-160195}}</ref>

'''[[Minecraft:Spectral arrow]]s'''
* Fired spectral arrows are now entirely golden to reflect the item texture in the Texture Update.<ref>{{bug|MC-150054}}</ref>

'''[[Minecraft:Sugar cane]]'''
* Changed the texture of the sugar cane item to better reflect biome tinting added in [[Minecraft:Java Edition 1.7.2|1.7.2]].<ref>{{bug|MC-216227}}</ref>

=== Mobs ===
'''[[Minecraft:Cat]]s'''
* Changed the texture of the siamese cat type, mostly brightening it.

'''[[Minecraft:Guardian]] and [[Minecraft:elder guardian]]'''
* Removed some stray pixels from the texture file.

'''[[Minecraft:Villager]]s and [[Minecraft:zombie villager]]s'''
* Moved the librarian top overlay texture to correct side of its torso.<ref>{{bug|MC-145501}}</ref>

=== Non-mob entities ===
'''[[Minecraft:Painting]]s'''
* Changed the back texture to reflect the planks texture in the Texture Update.

=== World generation ===
'''[[Minecraft:Caves]]'''
* Tweaked the cave sizes.

'''[[Minecraft:Lush caves]]'''
* Reduced the amount of floating water in lush caves.

'''[[Minecraft:Ore (feature)|Ore]]s'''
* Slightly increased the frequency of [[Minecraft:diamond ore]] blobs.
* If any ore replaces tuff, it is now deepslate ore.

=== Gameplay ===
'''[[Minecraft:Freezing]]'''
* Frozen hearts now have a different texture in [[Minecraft:Hardcore]] mode to reflect the regular heart texture.

'''[[Minecraft:Spectator]] mode'''
* It is now possible to see while inside [[Minecraft:lava]] and [[Minecraft:powder snow]].

'''[[Minecraft: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.<ref name="subtitle">{{bug|MC-219850}}</ref>
* 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.<ref name="subtitle"/>

=== General ===
'''[[Minecraft:Tag]]s'''
* Added cave vines and cave vines plant to the <code>climbable</code> block tag.
* Added tuff to the <code>deepslate_ore_replaceables</code> block tag.
* Added tinted glass to the <code>impermeable</code> block tag.
* Removed tuff from the <code>stone_ore_replaceables</code> block tag.

== Fixes ==
{{fixes|fixedin=21w11a
|;old
|1483|Snow covered grass/podzol/mycelium block side texture does not match original block.
|9591|Players are able to create ghost lily pads.
|12363|Lava / water / powder snow bucket desync when using it while rapidly turning.
|70850|False negatives during occlusion culling.
|71530|Spectators can't see through lava.
|86645|Scroll bar goes higher than chat overlay.
|145501|Librarian and zombie librarian torso top texture is incorrect.
|150054|Spectral arrow texture on item and entity aren't consistent.
|150784|Brewing Stand bottle outline incorrect.
|154006|Overworld wood signs use the outdated wood texture on all sides.
|160195|Jungle door inventory texture is outdated.
|160388|Painting back texture has not been updated with the texture update.
|169717|Blocks in recipe book groups are rendered in front of item tooltips.
|195806|Smoker's top and bottom textures have inconsistently colored pixels.
|197561|Carved pumpkins and jack o'lanterns create swastikas.
|197883|Jigsaw Structures causing <code>DataFixer</code> spam.
|198805|Floating pixel in the tailfin of a guardian/elder guardian.
|202186|Houses in Zombie Villages disappear when spawned using {{cmd|locate}}.
|202760|<code>area_effect_cloud</code> does not enforce a maximum radius.
|211513|Trident returning to owner not in the same world can cause permanent player kick.
|212123|Player lighting is inconsistent in the inventory and appears darker on the front.
|214568|Setting a lectern on fire causes z-fighting.
|216227|Sugar cane item texture is no longer accurate from 13w36a forward.
|;dev
|203554|<code>block.amethyst_block.chime</code> has no subtitle.
|203561|Amethyst crystal cluster drops items when block is moved directly by a piston without actually breaking the block.
|203623|Inconsistency: Breaking amethyst crystals with hands doesn't drop the item, but breaking the block they are placed on drops them.
|203676|Tinted Glass suffocates entities inside of it.
|203753|Spyglass use statistic never increases.
|203918|Mobs can spawn on tinted glass.
|204016|When filling a lava/powder snow cauldron with lava/powder snow, it is placed on the ground instead of in the cauldron.
|204115|Pushing an amethyst cluster off of a block with a 1-tick pulse using a sticky piston doesn't drop any items.
|204862|Tinted glass is not included in the <code>impermeable</code> tag.
|205913|Lightning rod can spawn skeleton horses with skeletons.
|206588|Blocks dripstone can be attached to are inconsistent.
|206787|World Border is rendered upside down.
|206805|World border texture moves up and down with the player.
|207557|Frozen hearts in hardcore mode look identical to frozen hearts in survival mode.
|208295|Moving water with a piston and amethyst cluster.
|212226|Bone Meal can still be used on a Glow Lichen when it is unable to grow.
|212410|Cannot compost glow lichen.
|213269|Waxed Copper Block cannot be crafted back into ingots.
|213271|Parity issue: Copper blocks cannot be waxed by either using honeycomb items on them or using dispensers with honeycombs.
|213583|Crash upon importing world generation settings with over 256 layers.
|213743|Spectators can't see through powder snow.
|213764|Removing the block supporting a spore blossom allows the spore blossom to float.
|213765|Cave vine blocks are inconsistent in ID from other similar blocks.
|213768|Removing the support block for hanging roots allows it to float.
|213778|Cave vines cannot be climbed.
|213782|Cave vines do not slow you down like other vines.
|213798|Cave vines head and body emit different light levels.
|213816|Hanging roots don't get destroyed by flowing water.
|213886|Bone meal cannot be used on dripleaf stems.
|213911|Cave vines body and cave vines head share the same name.
|213980|Moss appropriate tool is axe rather than hoe.
|214290|Crash upon importing world generation settings with a layer that is less than 0 blocks high.
|214780|It is not possible to create a superflat world with over 256 layers.
|214868|Big dripleaf won't drop the item if the top is underwater.
|214951|Superflat worlds start generating at negative coordinates, causing a dark horizon.
|215036|Snow layers in "Snowy Kingdom" superflat preset generate 64 blocks above the ground.
|215384|Azaleas cannot be used as a fuel.
|215417|Sky going dark y level ignores data pack dimension y axis limits ({{cd|minecraft:overworld}} effects).
|216018|Redstone Ready and Water World presets have the default spawn point at wrong Y-level.
|216134|Gilded blackstone texture does not match the new side texture of blackstone.
|216184|Player takes no fall damage on blocks above Y{{=}}316.
|216737|When replacing tuff, ores still generate with a "stone" background below Y{{=}}0.
|216945|Teams become dysfunctional when any entity leaves the team.
|216965|Flat "slices" of terrain generating in cracks.
|217303|Potential optimization target in <code>DepthBasedReplacingBaseStoneSource</code>.
|217546|<code>stat.fallOneCm</code> is not updated when falling onto a block above Y{{=}}316.
|217802|Some blocks generate at wrong Y height in a superflat world.
|;previous
|218587|Lightning rod still can't be waterlogged.
|218594|Debug chunk borders don't render properly.
|218596|Debug pie is blacked out.
|218597|Water has no fog anymore.
|218603|Screen turns dark grey when switching dimension.
|218604|Hanging roots can generate hanging on other hanging roots, making them float.
|218609|Mipmapping causes some block faces to become too dark.
|218610|Banners are unimpacted by light levels.
|218626|Cannot enchant items.
|218633|Smooth lighting has brighter outlines.
|218635|With fast graphics, the freezing overlay renders black, and covers the whole screen black in first person.
|218640|Broken spyglass overlay on fast graphics.
|218641|Red vignette shown when outside the world border is too intense.
|218645|The carved pumpkin overlay turns the screen completely black when using fast graphics.
|218652|The green nausea overlay no longer renders.
|218653|Glowing effect no longer changes to team color.
|218655|Floating water generates excessively in lush caves.
|218660|The nether portal overlay no longer renders, whilst using fast graphics.
|218695|Shulkers do not flash red when hurt or killed.
|218712|Debug pie has purple box when moving an enchanted item.
|218713|Right clicking to open alternate recipes does not show the recipes.
|218729|Noise cave entrances cause unnatural, smooth edges in terrain.
|218734|Caves generate with very blocky areas.
|218748|At sunset, a blue line appears in the northern and southern skies.
|218753|Ambient occlusion of the player seen in the survival inventory has changed.
|218793|Two white lines appear on the Mojang loading screen.
|218817|Cave Vines can generate without supporting blocks.
|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.
|218830|World border is white.
|218834|You can see block hitboxes very clearly under powder snow/lava.
|218845|Mojang logo screen flashes blue before changing to red.
|218852|World border is occasionally shown as a solid color upon being loaded.
|218877|The red flash when a mob is hurt/killed appears to be slightly dimmed.
|218881|When selecting text in the end, the sky gets highlighted.
|218911|The background of hover-event text becomes blue when text is selected in an anvil or chat.
|218945|Spyglass has a gradient effect while freezing.
|218979|Cave ceilings and floors sometimes too flat or blocky.
|218988|Fire is rendered dark in the player/horse/llama UI.
|218990|Transparency buffers start with blue background instead of empty background.
|219002|The wither's wither armor has a blue aura around it.
|219006|The background opacity of subtitles and chat, are affected by a potion effect UI fading out.
|219014|Charged creeper layer makes clouds and entities invisible.
|219036|World border is shown as a solid color when picking up items or experience orbs.
|219039|World border does not render when below the world.
|219049|Reloading resource packs no longer shows the progress bar while the transparent background is shown.
|219105|Entity hitboxes can be seen whilst inside of powder snow/lava.
|219108|Chat scroll bar is offset.
|219111|Social interactions scroll bar appears broken.
|219126|Spyglass allows looking through blocks.
|219180|Slime blocks, honey blocks, stained glass, and ice are fully lit when moved by pistons.
|219208|Using enchanted items allows looking through blocks.
|219212|Entity shadows can be seen whilst inside of powder snow/lava.
|219224|The background opacity of command syntax help is affected when highlighting text.
|219278|Being inside of a block no longer shows the block texture.
|219281|Dying ender dragon is rendered too bright.
|219392|Lead/fishing line is no longer affected by the fog from powder snow/lava.
|219597|End portal and end gateway textures expand as the player travels further from the block.
}}
</onlyinclude>

== Videos ==
{{slicedlime|a2gHgjCsexc|c1pGufNMhZ0}}

== Trivia ==
* This version has the same [[Minecraft:data version]] as [[Minecraft: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 [[Minecraft:24w33a]].

== References ==
{{Reflist}}

== Navigation ==
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Minecraft:Java Edition 21w11a - Revision history

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