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{{Infobox version
|title=Minecraft 24w21a
|image=24w21a.jpg
|image2=Java Edition 24w21a.png
|edition=Java
|type=Snapshot
|date=May 22, 2024
|jsonhash=a7346493faf4a8fd8bb4b9ea179ab60345d70b20
|clienthash=e01724ca24f6ad9e0f4669ab63d08a7a23e82be2
|clientmap=d4f9ffcc966ba9b479c261211030719431508cb3
|serverhash=6ba7192e60bedb3ff02db3c57b75f7ea56c63242
|servermap=69fd349bdd8ca1c79e57240e8eae9550d25565fd
|parent=1.21
|prevparent=1.20.6
|prev=24w20a
|next=24w21b
|nextparent=1.21.1
}}<onlyinclude>

'''24w21a''' is the fifth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.21]], released on May 22, 2024,<ref>{{snap|24w21a|May 22, 2024}}</ref> which introduces custom [[Minecraft:jukebox]] music and fixes bugs.

== Additions ==
=== Command format ===
''' [[Minecraft:Target selectors]] '''
* Added <code>@n</code> entity selector, selecting the nearest entity.
** This functions as <code>@e[sort=nearest,limit=1]</code>.
** Additional requirements may still be provided; for example: <code>@n[type=pig]</code> selects the closest pig.

=== General ===
''' [[Minecraft:Game rule]]s '''
* Added new <code>entitiesWithPassengersCanUsePortals</code> gamerule.
** Defaults to <code>false</code>.
** When <code>true</code>, entities with passengers can use nether portals, end portals and end gateways, and the waiting time for being transported through the portal is completely skipped.

''' [[Minecraft:Tag]]s '''
* Added the following block tag:
** <code>air</code>: {{cd|d=and|air|cave_air|void_air}}
*** Contains all blocks that resemble air.
* Added the following damage type tags:
** <code>panic_causes</code>: contains {{cd|d=and|#panic_environmental_causes|arrow|dragon_breath|explosion|fireball|fireworks|indirect_magic|magic|mob_attack|mob_projectile|player_attack|player_explosion|sonic_boom|sting|thrown|trident|unattributed_fireball|wind_charge|wither|wither_skull}}
*** Contains damage types that cause panic in passive animals, i.e. mobs that run away when attacked.
** <code>panic_environmental_causes</code>: contains {{cd|d=and|cactus|freeze|hot_floor|in_fire|lava|lightning_bolt|on_fire}}
*** Contains damage types that cause panic in aggressive animals that can panic, i.e. mobs that retaliate when attacked (wolves, polar bears (adults) and pandas).

== Changes ==
=== Blocks ===
'''[[Minecraft:Door]]s'''
* Doors of different materials now default to being placed oriented together to form a double door instead of both being placed with the hinge on the same side of the block.

'''[[Minecraft:Piston]]'''
* Reverted to the old sounds.
* Lowered volume of original sounds to address the initial feedback of pistons being too loud.

''' [[Minecraft:Vault]]'''
* Added a new sound on vault to help players understand they've already looted a vault.

=== Items ===
'''[[Minecraft:Bolt armor trim]]'''
* Can now be duplicated using a [[Minecraft:waxed block of copper]].

=== Mobs ===
'''General'''
* Animals now panic for 2 seconds after taking damage (down from 4).
* Animals now panic based on the damage caused by predefined damage source types.

'''[[Minecraft:Panda]]s, [[Minecraft:wolves]] and adult [[Minecraft:polar bears]]'''
* Now only panic from [[Minecraft:cactus]], [[Minecraft:freezing]], [[Minecraft:fire]] and [[Minecraft:lightning]] bolt damage.

=== World generation ===
'''Trial chambers'''
* Are less likely to generate in the [[Minecraft:deep dark]].

=== Command format ===
''' {{cmd|attribute}} '''
* The <code>uuid</code> and <code>name</code> arguments have been replaced with a singular <code>id</code> argument.

=== General ===
'''[[Minecraft:Attributes]]'''
* Attribute modifiers no longer have a UUID and name combination.
* Instead, attribute modifiers are now uniquely identified by a namespaced ID, similar to other resources.
* The ID of a modifier uniquely identifies it in the set of modifiers for a single attribute.
** Using the same ID for different modifiers is allowed as long as the modifiers are for different attributes.
* Existing built-in modifiers are upgraded to new IDs.
* Existing custom modifiers are upgraded to the GUID as an ID in the <code>minecraft</code> namespace.

'''Item stack attribute modifiers'''
* The <code>uuid</code> and <code>name</code> fields have been removed.
* Attribute modifiers now have an <code>id</code> (namespaced ID) field.
** This is a unique identifier per attribute for the modifier.

'''Entity attributes'''
* Are now stored in attribute format:
** <code>id</code>, renamed from <code>Name</code>.
** <code>base</code>, renamed from <code>Base</code>.
** <code>modifiers</code>, renamed from <code>Modifiers</code>.
*** Now stores modifiers in the same format as modifiers in <code>attribute_modifiers</code> item stack components:
**** <code>id</code>, replaces <code>UUID</code> and <code>Name</code>.
**** <code>amount</code>, renamed from <code>Amount</code>.
**** <code>operation</code>, renamed from <code>Operation</code>, now a named constant instead of an int:
***** <code>add_value</code> - previously 0.
***** <code>add_multiplied_base</code> - previously 1.
***** <code>add_multiplied_total</code> - previously 2.

'''Enchantments'''
* Attribute effects
** Fields:
*** <code>name</code> & <code>uuid</code> have been removed, replaced by <code>id</code>.
*** <code>id</code>: the namespaced ID of the attribute modifier to add.
**** This will be postfixed with the slot name when the enchanted item is equipped in a slot.
**** Must be unique to avoid different enchantments (or other systems) interfering with each others.

'''Entity effect types'''
* <code>damage_item</code>.
* The damage is not applied to items held by players in creative mode.
** Hit block parameters.
*** Entities: <code>this</code>.
*** Enchantment level.
*** Origin.
*** Block state.

'''Effect components'''
* <code>minecraft:hit_block</code>:
** Condition context: changed to take a hit block parameter - this is the entity hitting the block.

'''[[Minecraft:Tag]]s'''
* Some registry types that used legacy data pack directory names (based on plural name of element) have been renamed to match registry name.
** Affected directories:
*** <samp>structures</samp> -> <samp>structure</samp>
*** <samp>advancements</samp> -> <samp>advancement</samp>
*** <samp>recipes</samp> -> <samp>recipe</samp>
*** <samp>loot_tables</samp> -> <samp>loot_table</samp>
*** <samp>predicates</samp> -> <samp>predicate</samp>
*** <samp>item_modifiers</samp> -><samp>item_modifier</samp>
*** <samp>functions</samp> -> <samp>function</samp>
*** <samp>tags/functions</samp> -> <samp>tags/function</samp>
* Removed <code>breeze_immune_to</code> damage type tag.
* Removed <code>music_discs</code> item tag.

'''Predicates'''
* New item sub-predicate available as <code>jukebox_playable</code>.
** Matcher for <code>jukebox_playable</code> component (like music discs).
** Fields:
*** <code>song</code> - optional id, list of ids or tag for jukebox song to be matched.
* Player predicate
** The <code>gamemode</code> field has been changed to accept a list of gamemodes.

'''[[Minecraft:Data pack]]'''
* The [[Minecraft:pack format]] version is now <code>45</code>.

'''[[Minecraft:Item component]]s'''
* Added the <code>jukebox_playable</code> item component.
** If set, the item can be inserted into jukeboxes to play a song.
** Format: object with fields.
*** <code>song</code>: jukebox song id.
**** The song that is played by the jukebox when this item stack is inserted.
*** <code>show_in_tooltip</code>: boolean (default: true).
**** If false, the name of the song isn't shown in the tooltip.
**** This was formerly controlled by the hide_additional_tooltip component on music discs.
*** e.g. <code>jukebox_playable={song:'minecraft:precipice'}</code> <code>jukebox_playable={song:'minecraft:precipice', show_in_tooltip:false}</code>.

'''[[Minecraft:Jukebox]]'''
* Added a jukebox song registry which is loaded from data packs.
* Path to jukebox song definition is <samp>data/<namespace>/jukebox_song/<id>.json</samp>.
* Fields in definition:
** <code>sound_event</code> - sound event that is streamed when played by a jukebox.
** <code>description</code> - the name of the song that is displayed in the hover tooltip represented as a text component.
** <code>length_in_seconds</code> - length of the song in seconds as a positive float.
** <code>comparator_output</code> - the redstone signal output by a comparator when played in a jukebox, between 0 and 15.

'''Performance'''
* Improvements to the disconnection screen.
* In some cases client now stores detailed information about disconnection (similar to crash reports).
* When that happens, new "Open Disconnection Report Directory" button is added to the disconnection screen.
* When server provides link for bug reporting, it's also added as a button to the disconnection screen.

'''[[Minecraft:Realms]]'''
* Any member of a realm can now upgrade a world.
* In the realms main screen, all online players of a realm are displayed.
** When hovered, a tooltip is shown with each player's head and name.

'''[[Minecraft:Resource pack]]'''
* The [[Minecraft:pack format]] version is now <code>34</code>.
* Added the <code>block.vault.reject_rewarded_player</code> sound event.

'''[[Minecraft:Server]]'''
* Pause menu now can include a list of links provided by server.
* Server can now provide list of links to client.
* Servers can add custom details to crash and disconnection reports.
* New clientbound packet <code>custom_report_details</code> is available in <code>configuration</code> and <code>game</code> protocols.
* This packet contains a list of key-value text entries.
* If received, contents of this packet are added in a separate section to any crash or disconnection report generated during connection to this server.

'''Server link'''
* Servers can now provide a list of links to clients.
* If client has received any links, a new button called "Server Links..." shows up in pause game screen.
** To make space for that button, "Report Bugs" and "Give Feedback" buttons might be moved into a sub-screen if necessary.
* New clientbound packet <code>server_links</code> is available in <code>configuration</code> and <code>game</code> protocols.
* On receival, client makes links available from pause menu.
* Link labels can be built-in or custom (i.e. any text).
* Some built-ins also have special functionality:
** <code>report_bug</code>:
*** Link is displayed on disconnection screen, if disconnection was caused by packet handling error.
*** Link is included as a comment in disconnection report.
* Added <code>bug-report-link</code> to <code>server.properties</code> to allow vanilla server to configure <code>report_bug</code> links.
** If this field is non-empty, server sends that link to clients.
** This field should contain well-formed URL.

'''[[Minecraft:Shaders]]'''
* The <code>blend</code> block in core shader definitions has been removed, as it was not used.
* The <code>position_color_tex</code> shader has been removed, replaced with the pre-existing <code>position_tex_color</code>.
* The <code>glint_direct</code> shader has been removed, replaced with the pre-existing <code>glint</code> shader.
* The <code>armor_glint</code> shader has been removed, as it was unused.
'''[[Minecraft:Armor]]'''

*Burn time reduction effect now stacks on multiple armor pieces.
* Blast knockback reduction effect now stacks on multiple armor pieces.

== Fixes ==
{{fixes|fixedin=24w21a
|;old
|67|Entities with passengers cannot travel through portals.
|31819|Hunger saturation depletes on Peaceful.
|78473|Mobs don't panic when hit with a summoned or dispensed potion of harming.
|116279|Non-player entities going through nether portal do not generate portal in the Nether if none exists.
|151648|Non-player entities cannot travel through unlinked nether portals.
|170103|Untamed wolves only beg for food while being angry and jumping.
|253209|Some mobs will no longer panic when receiving poison/wither damage.
|260346|Custom music discs cut off when vanilla disc would normally end.
|262469|The "Remote Getaway" advancement isn't granted upon traveling through end gateways while riding boats.
|266290|Double doors do not automatically form between waxed and unwaxed copper doors, even of the same variant.
|266586|Trial chambers can spawn directly inside the Deep Dark biome.
|266626|Breeze doesn't stop attacking the player when it enters on the same team.
|267498|Operation names in {{cmd|attribute}} and item modifiers' {{cd|set_attributes}} are different.
|267967|Breezes ignore the {{cd|deflects_projectiles}} entity type tag.
|268438|Baby armadillos can still eat while rolled up.
|269034|Wolves no longer teleport while trying to pathfind out of lava.
|269351|The Bolt armor trim cannot be duplicated with waxed copper block.
|269370|Sharp lag spike caused by incorrect upper limit on particles created by mace smash attack.
|269460|Thorns enchantment doesn't work when entities are hit by wind charges.
|269964|Ominous item spawners are missing an NBT load for {{cd|spawn_item_after_ticks}}.
|269988|New potion effects don't apply their respective behaviors when creeper explodes.
|270024|When drinking ominous bottles, Bad Omen of higher levels can be overriden by lower amplifiers.
|270377|Wind charges can be hit and redirected the moment they are thrown.
|270573|Mounted entities are immune to wind charge damage.
|270749|Remote Getaway advancement is not granted when entering a gateway by throwing an ender pearl next to it.
|270808|Any item in the {{cd|armor.body}} slot protects wolves from taking damage.
|;dev
|271458|Channeling tridents no longer summon lightning bolt when hitting a lightning rod during a thunderstorm.
|271573|Attribute enchantments don't behave properly on armor.
|271634|Custom enchantments don't appear in the Creative menu.
|271718|Crash when {{cd|randomized_int_state_provider}} is applied to blocks lacking the property.
|271753|Crash due to overflow inside cost calculation in {{cd|by_cost_with_difficulty}}.
|271856|Crossbows enchanted with Quick Charge do not benefit from its effects when used in the offhand.
|271868|Frost Walker replaces flowing water now.
|271901|Entity effect "{{cd|play_sound}}" field "{{cd|pitch}}" value upper limit is 1.0 instead of 2.0.
|271911|Frost Walker no longer works with void or cave air.
|271914|Soul Speed enchantment doesn't emit particles when the entity is controlled by a player.
|272039|Soul Speed uses durability in Creative mode.
|272182|Knowledge books no longer function properly with a stack size of 1 in Survival/Adventure mode.
|;previous
|272042|If players have max health over 20 and die, when they respawn they will have 20 health instead of their max health.
|272043|The game crashes when entities die while having the Oozing effect.
|272075|Attempting to step up while controlling entity and moving fast often glitches.
|272084|Creepers with potion effects no longer create area effect clouds upon exploding.
}}</onlyinclude>

== Videos ==
{{slicedlime|h5TxlG8ffy0|arbQtUyVsPs}}

== References ==
{{Reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.2x}}

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Minecraft:Java Edition 24w21a - Revision history

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