Java Edition 24w21a

Minecraft 24w21a
Edition	Java Edition
Release date	May 22, 2024
Type	Snapshot
Snapshot for	1.21
Downloads	Client (.json); Server
Obfuscation maps	Client; Server
Protocol version	dec: 1073742021; hex: 400000C5
Data version	3946
Resource pack format	34
Data pack format	45
Minimum Java version	Java SE 21

24w21a is the fifth snapshot for Java Edition 1.21, released on May 22, 2024,^[1] which introduces custom jukebox music and fixes bugs.

Additions

Command format

Target selectors

Added @n entity selector, selecting the nearest entity.
- This functions as @e[sort=nearest,limit=1].
- Additional requirements may still be provided; for example: @n[type=pig] selects the closest pig.

General

Game rules

Added new entitiesWithPassengersCanUsePortals gamerule.
- Defaults to false.
- When true, 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.

Tags

Added the following block tag:
- air: air, cave_air, and void_air
  - Contains all blocks that resemble air.
Added the following damage type tags:
- panic_causes: contains #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, and wither_skull
  - Contains damage types that cause panic in passive animals, i.e. mobs that run away when attacked.
- panic_environmental_causes: contains cactus, freeze, hot_floor, in_fire, lava, lightning_bolt, and 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

Doors

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.

Piston

Reverted to the old sounds.
Lowered volume of original sounds to address the initial feedback of pistons being too loud.

Vault

Added a new sound on vault to help players understand they've already looted a vault.

Items

Bolt armor trim

Can now be duplicated using a 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.

Pandas, wolves and adult polar bears

Now only panic from cactus, freezing, fire and lightning bolt damage.

World generation

Trial chambers

Are less likely to generate in the deep dark.

Command format

/attribute

The uuid and name arguments have been replaced with a singular id argument.

General

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 minecraft namespace.

Item stack attribute modifiers

The uuid and name fields have been removed.
Attribute modifiers now have an id (namespaced ID) field.
- This is a unique identifier per attribute for the modifier.

Entity attributes

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

Enchantments

Attribute effects
- Fields:
  - name & uuid have been removed, replaced by id.
  - id: 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

damage_item.
The damage is not applied to items held by players in creative mode.
- Hit block parameters.
  - Entities: this.
  - Enchantment level.
  - Origin.
  - Block state.

Effect components

minecraft:hit_block:
- Condition context: changed to take a hit block parameter - this is the entity hitting the block.

Tags

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:
  - structures -> structure
  - advancements -> advancement
  - recipes -> recipe
  - loot_tables -> loot_table
  - predicates -> predicate
  - item_modifiers ->item_modifier
  - functions -> function
  - tags/functions -> tags/function
Removed breeze_immune_to damage type tag.
Removed music_discs item tag.

Predicates

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

Data pack

The pack format version is now 45.

Item components

Added the jukebox_playable item component.
- If set, the item can be inserted into jukeboxes to play a song.
- Format: object with fields.
  - song: jukebox song id.
    - The song that is played by the jukebox when this item stack is inserted.
  - show_in_tooltip: 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. jukebox_playable={song:'minecraft:precipice'} jukebox_playable={song:'minecraft:precipice', show_in_tooltip:false}.

Jukebox

Added a jukebox song registry which is loaded from data packs.
Path to jukebox song definition is data/<namespace>/jukebox_song/<id>.json.
Fields in definition:
- sound_event - sound event that is streamed when played by a jukebox.
- description - the name of the song that is displayed in the hover tooltip represented as a text component.
- length_in_seconds - length of the song in seconds as a positive float.
- comparator_output - 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.

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.

Resource pack

The pack format version is now 34.
Added the block.vault.reject_rewarded_player sound event.

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 custom_report_details is available in configuration and game 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 server_links is available in configuration and game 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:
- report_bug:
  - Link is displayed on disconnection screen, if disconnection was caused by packet handling error.
  - Link is included as a comment in disconnection report.
Added bug-report-link to server.properties to allow vanilla server to configure report_bug links.
- If this field is non-empty, server sends that link to clients.
- This field should contain well-formed URL.

Shaders

The blend block in core shader definitions has been removed, as it was not used.
The position_color_tex shader has been removed, replaced with the pre-existing position_tex_color.
The glint_direct shader has been removed, replaced with the pre-existing glint shader.
The armor_glint shader has been removed, as it was unused.

Armor

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

Fixes

42 issues fixed

From released versions before 1.21

MC-67 – Entities with passengers cannot travel through portals.
MC-31819 – Hunger saturation depletes on Peaceful.
MC-78473 – Mobs don't panic when hit with a summoned or dispensed potion of harming.
MC-116279 – Non-player entities going through nether portal do not generate portal in the Nether if none exists.
MC-151648 – Non-player entities cannot travel through unlinked nether portals.
MC-170103 – Untamed wolves only beg for food while being angry and jumping.
MC-253209 – Some mobs will no longer panic when receiving poison/wither damage.
MC-260346 – Custom music discs cut off when vanilla disc would normally end.
MC-262469 – The "Remote Getaway" advancement isn't granted upon traveling through end gateways while riding boats.
MC-266290 – Double doors do not automatically form between waxed and unwaxed copper doors, even of the same variant.
MC-266586 – Trial chambers can spawn directly inside the Deep Dark biome.
MC-266626 – Breeze doesn't stop attacking the player when it enters on the same team.
MC-267498 – Operation names in /attribute and item modifiers' set_attributes are different.
MC-267967 – Breezes ignore the deflects_projectiles entity type tag.
MC-268438 – Baby armadillos can still eat while rolled up.
MC-269034 – Wolves no longer teleport while trying to pathfind out of lava.
MC-269351 – The Bolt armor trim cannot be duplicated with waxed copper block.
MC-269370 – Sharp lag spike caused by incorrect upper limit on particles created by mace smash attack.
MC-269460 – Thorns enchantment doesn't work when entities are hit by wind charges.
MC-269964 – Ominous item spawners are missing an NBT load for spawn_item_after_ticks.
MC-269988 – New potion effects don't apply their respective behaviors when creeper explodes.
MC-270024 – When drinking ominous bottles, Bad Omen of higher levels can be overriden by lower amplifiers.
MC-270377 – Wind charges can be hit and redirected the moment they are thrown.
MC-270573 – Mounted entities are immune to wind charge damage.
MC-270749 – Remote Getaway advancement is not granted when entering a gateway by throwing an ender pearl next to it.
MC-270808 – Any item in the armor.body slot protects wolves from taking damage.

From the 1.21 development versions

MC-271458 – Channeling tridents no longer summon lightning bolt when hitting a lightning rod during a thunderstorm.
MC-271573 – Attribute enchantments don't behave properly on armor.
MC-271634 – Custom enchantments don't appear in the Creative menu.
MC-271718 – Crash when randomized_int_state_provider is applied to blocks lacking the property.
MC-271753 – Crash due to overflow inside cost calculation in by_cost_with_difficulty.
MC-271856 – Crossbows enchanted with Quick Charge do not benefit from its effects when used in the offhand.
MC-271868 – Frost Walker replaces flowing water now.
MC-271901 – Entity effect "play_sound" field "pitch" value upper limit is 1.0 instead of 2.0.
MC-271911 – Frost Walker no longer works with void or cave air.
MC-271914 – Soul Speed enchantment doesn't emit particles when the entity is controlled by a player.
MC-272039 – Soul Speed uses durability in Creative mode.
MC-272182 – Knowledge books no longer function properly with a stack size of 1 in Survival/Adventure mode.

From the previous development version

MC-272042 – If players have max health over 20 and die, when they respawn they will have 20 health instead of their max health.
MC-272043 – The game crashes when entities die while having the Oozing effect.
MC-272075 – Attempting to step up while controlling entity and moving fast often glitches.
MC-272084 – Creepers with potion effects no longer create area effect clouds upon exploding.

Video

Videos made by Slicedlime:

References

↑ "Minecraft Snapshot 24w21a" – Minecraft.net, May 22, 2024.

Navigation

[1] "Minecraft Snapshot 24w21a" – Minecraft.net, May 22, 2024.

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