Minecraft Snapshot 24w21a

This week we're bringing a Snapshot you can vibe out to! This time around we're bringing data-driven jukeboxes, a new gamerule, and a bunch of fixes.

Happy vibing!

Changes#

• It seems we cooked a bit too hard with the new Piston sounds last week, which is why we're reverting back to the old sounds again
• Lowered volume of original sounds to address initial feedback of Pistons being too loud
• Pause menu now can include a list of links provided by server
• Improvements to the disconnection screen
• 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

Vault#

• Added sound effect to help players understand they've already looted a vault

Trial Chambers#

• Trial Chambers are less likely to generate in the Deep Dark

Animal Panic#

• Animals now panic based on the damage caused by predefined Damage Source Types
• The panic lasts for 2 seconds after the damage is dealt. The following damage type tags are used by vanilla animals:
  • panic_environmental_causes: Used by Wolves, Polar Bears (adults) and Pandas
  • panic_causes: Used by all other animals and baby Polar Bears

Server links#

• Servers can now provide a list of links to clients
• If client has received any links, a new button called "Server Links..." will show 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

Disconnection screen improvements#

• In some cases client will now store detailed information about disconnection (similar to crash reports)
• When that happens, new "Open Disconnection Report Directory" button will be added to the disconnection screen
• When server provides link for bug reporting, it will be also be added as a button to the disconnection screen

Technical Changes#

• Resource Pack version is now 34
• Data Pack version is now 45
• Server can now provide list of links to client
• Servers can add custom details to crash and disconnection reports

Gamerules#

• Added new entitiesWithPassengersCanUsePortals gamerule
  • When true, entities with passengers can use Nether Portals, End Portals and End Gateways
  • Defaults to false

Server links#

• New clientbound packet server_links is available in configuration and game protocols
• On receival, client will make links available from pause menu
• Link labels can be built-in or custom (i.e. any text)
• Some built-ins also have special fuctionality:
  • report_bug:
    • link will be displayed on disconnection screen, if disconnection was caused by packet handling error
    • link will be 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 will send that link to clients
  • This field should contain well-formed URL

Custom server crash report details#

• 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 will be added in a separate section to any crash or disconnection report generated during connection to this server

Data Pack Version 45#

• Jukebox songs are now data-driven
• Added new command syntax

Jukebox Songs#

• 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 will be 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
• Added minecraft:jukebox_playable item stack component

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 will be played by the Jukebox when this item stack is inserted
  • show_in_tooltip: boolean (default: true)
    • If false, the name of the song will not be 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}

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 will be upgraded to new IDs
• Existing custom modifiers will be upgraded to the GUID as an ID in the minecraft namespace

attribute command#

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

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#

• Attributes are now stored as attributes
• 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#

Directory renames#

• Some registry types that used legacy datapack 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

Item Tags#

• Removed music_discs item tag

Block Tags#

• air: All blocks that resemble air

Damage Type Tags#

• Removed breeze_immune_to damage type tag
• Added panic_environmental_causes: Damage types that cause panic in aggressive animals that can panic, i.e. mobs that retaliate when attacked
• Added panic_causes: Damage types that cause panic in passive animals, i.e. mobs that run away when attacked

Predicates#

Jukebox Playable Predicate#

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

Commands#

• 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] will select the closest Pig

Resource Pack Version 34#

• Added the block.vault.reject_rewarded_player sound event
• Changes to Shaders

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

Fixed bugs in 24w21a#

• MC-67 Entities with passengers cannot travel through portals
• MC-31819 Hunger saturation depletes on peaceful difficulty
• MC-116279 Non-player entities going through Nether portal do not generate portal in 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-260346 Custom music discs cut off when vanilla disc would normally end
• 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-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-270808 Any item in the armor.body slot protects wolves from taking damage
• MC-271458 Channeling tridents no longer summon lightning bolt every time hitting lightning rod under 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-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
• MC-272182 Knowledge Books no longer function properly with a stack size of 1 in survival/adventure mode