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{{Infobox version
|title=Minecraft 21w18a
|image=21w18a.jpg
|image2=Java Edition 21w18a.png
|edition=Java
|type=Snapshot
|date=May 5, 2021
|jsonhash=adfced36701cbfa258de0fd38f0bc1f9408632f6
|clienthash=f52cf94abf99911ca88c12f776bcf30c9b6f1617
|clientmap=95bea66557e205298d65d8c48924013d6afa5e57
|serverhash=0b18d883bd1132f761aa715d6a97e29e54a9b8b6
|servermap=fb0c905d83afce0ef48001acd490f1932ed3c0cc
|otherdl={{dl|6b510a715701aec5e601c7966d87922a300e0c73|custom|name=CavesAndCliffsPreview.zip|title=Data pack}}<ref group=note>Re-enables features set to release for [[Minecraft:Java Edition 1.18|1.18]].</ref>
|parent=1.17
|prevparent=1.16.5
|prev=21w17a
|next=21w19a
|nextparent=1.17.1
}}<onlyinclude>

'''21w18a''' is the twentieth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.17]], released on May 5, 2021,<ref>{{snap|21w18a|May 5, 2021}}</ref> which makes changes to goats and experimental ore generation, as well as fixes some bugs.

== Changes ==
=== Blocks ===
'''[[Minecraft:Infested block]]s'''
* Instead of breaking instantly, they now take half of the time to break compared to their regular counterparts. They still have no assigned tool.<ref>{{bug|MC-224927|||Fixed}}</ref><ref>{{bug|MC-224972|||Fixed}}</ref>

'''[[Minecraft:Light Block|Light]]'''
* Changed the textures of the light block displayed in the inventory or when holding it.

=== Items ===
'''[[Minecraft:Amethyst cluster]]s'''
* The item models for amethyst buds, except for the amethyst cluster, have been changed so they appear higher in inventory slots.

=== Mobs ===
'''[[Minecraft:Goat]]s'''
* Screaming goats now use their ram attack more often than other goats.
* The pitch for the sound of baby goats ramming into stuff has been increased.

=== General ===
'''[[Minecraft:Tag]]s'''
* Added [[Minecraft:raw gold block]]s to the <code>guarded_by_piglins</code> block tag and the <code>piglin_loved</code> block tag.

'''[[Minecraft:Textures]]'''
* Removed the unused mouth textures from the [[Minecraft:axolotl]] textures.
* The [[Minecraft:goat]]'s two ear textures have been changed to mirror properly.

=== Experimental ===
Changes have been made to the official Caves & Cliffs world generation preview datapack, which gives early access to the world generation coming in [[Minecraft:Java Edition 1.18]].

'''[[Minecraft:Cave]]s'''
* Cave carvers generate below Y=0 in [[Minecraft:ocean]] biomes.
* Increased the minimum size of noodle caves and carvers, to make them easier to traverse and less likely to break up into fragments.
* Noodle caves no longer generate above Y=30.

[[File:21w18a approximate ore distribution.jpg|thumb|Changes in the ore distribution.]]
'''[[Minecraft:Ore]] distribution'''
* Reduced [[Minecraft:copper ore]] spawning a bit, to compensate for large ore veins.
* Large [[Minecraft:ore vein]]s are slightly more rare and slightly smaller on average. They now vary significantly, meaning players can still find huge ore veins like the ones in previous versions.
* Increased chance of finding raw ore blocks in ore veins.
* Removed [[Minecraft:deepslate]] blobs above Y=0.
* Extended the vertical range of the smaller blobs of [[Minecraft:iron ore]], to make it possible to find iron in caves near the surface.
* Slightly reduced the amount of normal-sized iron blobs, to compensate for large ore veins and the increased range of smaller blobs.

== Fixes ==
{{fixes|fixedin=21w18a|showdesc=1
|;old
|3587|Last use of an anvil causes player to drop their item.
|162953|<code>NativeImage</code> bounds checks are incorrect.
|172362|Lava item burning sound does not play sometimes.
|177630|Infested Stone blocks are mined instantly with Silk Touch.
|179116|Burning item sound ignores lava hitbox level.
|190247|Mob death cloud particles do not show up when killing a mob shortly after the world is loaded.
|197616|Certain custom biome settings cause game to spam "<code>Received invalid biome id: -1</code>" in the console, causing major lag or freeze.
|205797|Zoglins attack <code>Marker</code> armor stands and Invisible armor stands.
|206560|Pufferfish react to <code>Marker</code> armor stands and Invisible armor stands.
|208430|Minecraft crashes when loading resource pack due to "<code>tessellating block model</code>".
|211064|Loading in a TrueTypeFont with an out-of-bounds size crashes the game.
|;dev
|203566|Small/Medium amethyst buds don't show up in your hand.
|204707|Adventure mode players can extinguish candles.
|204969|No "Burning" sound for items burning in lava cauldron.
|208679|Axolotl inconsistently doesn't show its mouth in-game.
|214159|Small Dripleaf sometimes shrink into smaller (1 block tall) Big Dripleaf when using bone meal.
|214427|Spore Blossoms can be used to breathe underwater / cannot be waterlogged.
|214793|Some strips of chunks generate completely dark.
|214808|World occasionally fails to load correctly.
|214860|Some chunks in a line are lit up constantly.
|214898|Extreme world generation lag.
|215867|Crash: <code>java.lang.IllegalStateException: Chunk not there when requested</code>.
|216148|Some chunks occasionally don't save properly, resetting progress.
|221611|Texture missing on parts of Light item levels 2-6.
|221617|Light block has an unnecessarily large texture.
|221647|Goat Babies Don't Follow Parents.
|221725|Legs of goats move differently.
|221727|Goat eye height is outside of its hitbox while airborne.
|221829|Leads on Goats appear a little too high.
|221840|Goats can still do high jumps normally when on honey blocks.
|221867|No subtitle for <code>entity.goat.prepare_ram</code>.
|222007|Giving a light block with a negative <code>BlockStateTag.level</code> value shows particle texture in inventory.
|222072|Problems connecting to server, getting kicked off.
|222151|Goat head animation is weird when it rides a boat.
|222157|Eye position of the goat is too high in some cases, causing suffocation.
|222458|UVs on the goat's ears aren't mirrored as they should be.
|223141|Piglins aren't attracted to a Block of Raw Gold.
|223145|Piglins aren't angered when mining a Block of Raw Gold.
|223150|Goats ram <code>Marker</code> armor stands & Invisible armor stands.
|223166|Various goat sounds do not have any subtitles.
|223178|Deepslate Tile Stairs come before Deepslate Brick Stairs in the creative inventory.
|223203|Deepslate ore map colors are inconsistent with deepslate.
|223239|Ramming sound that comes from a baby goat does not change pitch.
|223422|When removing water from base of Small Dripleaf, the block stands without water untill {{sic}} a block update.
|223441|A redundant torch in the panorama background.
|;previous
|224401|Mob death does not show death particles.
|224428|Raw ore blocks can generate as floating blocks in ore veins.
}}</onlyinclude>

== Videos ==
{{slicedlime|1AsoNsHPJtg|CLKdKfnvt2c}}

== Trivia ==
* This snapshot lacked an image when the changelog was released on Minecraft.net. The alt text that appeared said "A goat standing on a hill. Very regal.". Image still can be accessed via the [https://www.minecraft.net/content/dam/games/minecraft/screenshots/snapshot-21w18a-header.jpg link] on the page.
* Ore distribution image contained hidden messages.
** The ore distribution chart has upside down black text in the deepslate area that said: "Yes the first message is still here, But{{sic}} upside down".
** A vertical line of text can be found in the coal area, saying "Someday I'm gonna run out of space to hide these messages".
** "We must stop messing like this!" can be found in the border of the new ore distributions image.
* This is the last snapshot which can be launched with Java 8 - Java 15.

== Gallery ==
<gallery>
Missing 21w18a changelog image.png|The missing changelog image
</gallery>

== References ==
{{Reflist}}

== Notes ==
{{Notelist}}

== Navigation ==
{{Navbox Java Edition versions|1.1x}}

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Minecraft:Java Edition 21w18a - Revision history

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