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    News
    Java Team
    Written By
    Java Team
    Published
    3/20/24

    Minecraft Snapshot 24w12a

    A Minecraft Java Snapshot

    Here's snapshot 24w12a with new advancements and several tweaks.

    Happy Mining!

    Experimental Features

    Trial Chambers

    Trial Chambers now generate slightly more rarely and a bit more spaced out from each other

    Trial Chambers Explorer Map

    • Struggle no more to locate a Trial Chamber - level up your nearest Cartographer to Journeyman for the opportunity to trade for an Explorer Map pointing to a nearby Trial Chamber

    Heavy Core

    • Can now be waterlogged
    • Survives lava flows
    • Most efficient tool is now the pickaxe
    • Adjusted destroy time and explosion resistance

    Advancements

    • Added the following advancements:
      • Minecraft: Trial(s) Edition - Step foot in a Trial Chamber
      • Under Lock & Key - Unlock a Vault using a Trial Key
      • [Challenge - 40 exp] Blowback - Kill a Breeze with a deflected Wind Charge
      • Who Needs Rockets? - Use a Wind Charge to launch yourself upward at least 8 blocks
      • Crafters Crafting Crafters - Be near a Crafter when it crafts a Crafter
      • Lighten Up - Scrape a Copper Bulb with an Axe to make it brighter
      • Over-Overkill - Deal 50 hearts of damage in a single hit using the Mace

    Technical Changes

    • The Data Pack version is now 36
    • The Resource Pack version is now 30
      • Particle entity_effect takes color argument when spawned from command
      • /particle entity_effect <r> <g> <b> <a>
      • 4 float values ranging from 0.0 to 1.0 representing RGBA

    Data Pack Version 36

    • Added a crafter_recipe_crafted trigger which is triggered when a Crafter ejects a successfully crafted item into the world.
      • <player> an entity predicate matching the player who is nearby
      • <recipe_id> is the ID of the recipe being crafted
      • <ingredients> is a list of item predicates matching the ingredients that form the recipe being crafted
    • Added a fall_after_explosion trigger which is triggered when a player begins falling after being knocked upwards by an explosion or wind burst
      • <player> an entity predicate matching the player who is falling
      • <start_position> a location predicate matching the position the player was at when they were hit by the explosion or burst
      • <distance> a distance predicate matching how far the player must be from start_position to cause the trigger to activate
      • <cause> an entity predicate matching the entity which caused the explosion or burst to happen
    • Added storage loot number provider to access values from command storage
    • New Entity Type Tag: sensitive_to_smite - for Entity Types that take extra damage from the Smite Enchantment
    • Expanded item predicate syntax used in execute if|unless items and clear commands
    • Removed redundant custom data section ({...}) from item arguments (it's fully replaced by [custom_data={...}])
      • To make this transition easier, custom_data item sub-predicate has been changed to allow unquoted SNBT
    • Added wolf entity sub-predicate for matching wolf variants
    • wolf, cat, frog and painting entity sub-predicates now accept tags and plain lists instead of just single elements
    • Changed texture asset paths in wolf_variant to better match other formats
    • Command arguments that previously accepted namespaced ids of loot tables, modifiers and predicates can now also accept inline definitions
    • Added new item stack components
    • Added new loot functions

    wolf_variant definitions

    • Field texture has been renamed to wild_texture
    • wild_texture, tame_texture and angry_texture no longer require values to be prefixed with textures/ and suffixed with .png

    Commands

    Inline loot values

    Arguments in following commands that previously accepted namespaced ids of loot tables, modifiers and predicates can now also accept inline definitions:

    • loot
    • item
    • execute if predicateValues have same structure as matching JSON files, though they are encoded as SNBT.Example: execute if predicate {condition:weather_check, raining:true}

    Loot tables

    storage number provider

    • This number provider is able to access numeric values from command storage directly
    • If selected storage does not exist or tag selected by path is not numeric or does not exist, provider returns 0
    • Fields:
      • storage - namespaced id of command storage
      • path - NBT path to field

    set_lore function

    • The replace field has been removed
    • Now has mode like set_fireworks and set_written_book_pages

    set_written_book_pages function

    • pages is now a JSON Object rather than a string containing JSON

    toggle_tooltips loot function

    • This function can be used to modify item component tooltip visiblity
    • It works by setting fields like show_in_tooltip without changing other values
    • Format:
      • toggles - a map of supported item component type to boolean value
    • Supported components: trim, dyed_color, enchantments, stored_enchantments, unbreakable, can_break, can_place_on, attribute_modifiers
    • Example:
      • {function:"toggle_tooltips","toggles":{"enchantments":false}} will hide enchantments tooltip

    Functions

    • Nested lists are no longer supported in function lists

    Item predicate argument

    The item predicate syntax (used in execute if|unless items and clear commands) has been significantly expanded.

    • The general syntax is: <type> [comma-separated list of <test>]
    • <type> can be one of:
      • item id
      • item tag id prefixed with #
      • * to match any item
    • <test> can have one of 3 forms:
      • <component_id>=<value> - match exact value of component (same as in previous format)
        • <value> is a representation of component value in SNBT format (same as in item give argument)
      • <component_id> - check if component exists
      • <predicate_id>~<value> - check item sub-predicate
        • <value> is a representation of item sub-predicate in SNBT format (but otherwise same as one used for advancement and loot table JSON files)
        • Example: *[damage~{durability:{min:3}}] will match any stack with at least 3 uses left
    • The special name minecraft:count can be used for matching the stack size
      • count=<positive int> will pass only when the stack size equals the given value
      • count~<int range> will pass when the stack size is in the specified range
        • Example: *[count~{max:2}] will match any stack with count <= 2
      • count will always pass
    • Any <test> entry can be negated by prefixing with !
      • Example: *[!count=1] will match any stack that has count other than 1
    • <test> elements can be also joined with | to check multiple alternatives
      • Example: *[!damage|damage=0] will look for items without damage component or with 0 damage
    • The syntax for custom data partial matching ({}) has been removed in favor of using custom_data predicates
      • So stick{a:2} becomes stick[custom_data~{a:2}]

    Predicates

    Item sub-predicates

    • Predicate minecraft:custom_data now accepts both SNBT data written as a string (existing format) and unflattened tags
      • That means that *[custom_data~{a:1}] and *[custom_data~"{a:1}"] are equivalent
      • Flattened string format has been kept since NBT type information can't be expressed in JSON

    Entity sub-predicates

    wolf

    New wolf sub-predicate has been added to match wolf variantsFields:

    • variant - wolf variant to match (single entry, list of entries or tag)
    cat, frog, painting
    • Field variant now accepts single entries, list of entries or tags

    New Item Stack Components

    minecraft:food

    • When present, this item will behave as if a food (can be eaten)
    • Format: object with fields
      • nutrition: non-negative integer, number of food points to restore when eaten
      • saturation_modifier: float, amount of saturation to restore when eaten
      • is_meat: boolean (default: false)
        • If true, can be fed to Wolves
      • can_always_eat: boolean (default: false)
        • If true, this food can be eaten even if not hungry
      • eat_seconds: float (default: 1.6)
        • The number of seconds that it takes to eat this food item
      • effects: list of effects to apply when eaten (default: [])
        • effect: effect instance (same format as custom_effects in minecraft:potion_contents component)
        • probability: float between 0 and 1, chance for the effect to be applied (default: 1)
      • e.g: food={nutrition:4,saturation_modifier:0.1}
    • On food items, has an implicit default value for that food type

    minecraft:max_stack_size

    • Controls the maximum stacking size of this item
    • Format: integer between 1 and 99
      • e.g. max_stack_size=4
    • Has an implicit default value according to the item type (usually 64)

    minecraft:max_damage

    • Controls the maximum amount of damage than an item can take
    • If not present, the item cannot be damaged
    • Format: positive integer
      • e.g. max_damage=123
    • Has an implicit default value for damageable items

    minecraft:fire_resistant

    • If present, this item will not burn in fire
    • Format: empty object
      • e.g. fire_resistant={}
    • Has an implicit default value for fire-resistant items such as Netherite

    minecraft:rarity

    • Controls the color of the item name
    • Format: enumerated value, one of:
      • common (default): white name, or aqua when enchanted
      • uncommon: yellow name, or aqua when enchanted
      • rare: aqua name, or light purple when enchanted
      • epic: light purple name
      • e.g. rarity=rare
    • Special items such as Golden Apples have an implicit default value

    minecraft:tool

    • Controls the behavior of the item as a tool
    • Format: object with fields
      • rules: list of rule entries
        • blocks: single block, list of blocks, or #-prefixed block tag to match
        • speed (optional): float, overrides the mining speed if present and matched
        • correct_for_drops (optional): boolean, overrides whether this tool is considered 'correct' if present and matched
          • true will cause the block to mine at its most efficient speed, and drop items if the targeted block requires that
      • default_mining_speed: float, mining speed to use if no rules match and override mining speed (default: 1.0)
      • damage_per_block: non-negative int, amount of durability to remove each time a block is mined with this tool
      • e.g. tool={rules:[{blocks:"#mineable/pickaxe",speed:4.0,correct_for_drops:true}]}
    • Vanilla tool items will have an implicit default value based on their tier and tool type

    hide_tooltip

    • If present, it will completely hide whole item tooltip (that includes item name)
    • Tooltip will be still visible and searchable in creative mode
    • Format: empty object

    New Tags

    • Added incorrect_for_wooden_tool, incorrect_for_gold_tool, incorrect_for_stone_tool, incorrect_for_iron_tool, incorrect_for_diamond_tool, incorrect_for_netherite_tool block tags
      • These tags combine the existing needs_diamond_tool, needs_iron_tool, and needs_stone_tool tags for each specific tool tier
    • Added meat collection item tag
      • This is not used by the game directly, but may be included by other tags
    • Added piglin_food, fox_food, cow_food, goat_food, sheep_food, wolf_food, cat_food, horse_food, horse_tempt_items, camel_food, armadillo_food, bee_food, chicken_food, frog_food, hoglin_food, llama_food, llama_tempt_items, ocelot_food, panda_food, pig_food, rabbit_food, strider_food, strider_tempt_items, turtle_food, parrot_food, parrot_poisonous_food item tags to control which items can be fed to or tempt the corresponding mobs
    • axolotl_tempt_items has been renamed to axolotl_food

    Resource Pack Version 30

    • Map decoration icons have been split from the former map_icons.png to use an atlas loaded from the textures/map/decorations/ directory
    • The process of upgrading your pack can be assisted by using this automated Slicer tool
    • Added trial_chambers map decoration icon

    Fixed bugs in 24w12a

    • MC-266467 - Wind charges stutter when flying through the air
    • MC-267747 - Click and hover events don't work when viewing chat while F1 is enabled
    • MC-267933 - Silk Touch and Fortune enchanted books cannot be found in Creative inventory
    • MC-267943 - Anvil exclusive enchantments can be obtained from enchanting tables
    • MC-268068 - Pieces of text in the "Reset World" realm menu can intersect when using some resolutions
    • MC-268171 - Some GUI textures can no longer be transparent in Minecraft
    • MC-268311 - Bane of arthropods enchantment uses #arthropods tag instead of #sensitive_to_bane_of_arthropods
    • MC-268312 - Impaling enchantment uses #aquatic tag instead of #sensitive_to_impaling
    • MC-268343 - Breeze charge has laggy unnatural flightpaths when punched
    • MC-268510 - Items with "Unbreakable:1b" NBT can no longer have the unbreaking enchant applied
    • MC-268556 - Wind charges go through non-full blocks instead of colliding
    • MC-269083 - Effect background texture in inventory renders translucent pixels as opaque
    • MC-269085 - Experience bar and jump bar render translucent pixels as opaque
    • MC-269169 - Wolf variant not present in advancement criteria
    • MC-269268 - components don't work on the smithing table
    • MC-269280 - The right side of incompatible resource or data packs isn't rendered correctly when the scroll bar is present
    • MC-269299 - The red text within the "Experiments" menu cannot be narrated or selected
    • MC-269336 - Crash with set_enchantments item modifier above level 255
    • MC-269354 - The subtitle for the "minecraft:item.mace.smash_air" sound event displays as a raw translation string
    • MC-269355 - Heavy Core has no required tool
    • MC-269356 - Heavy Core cannot be oriented despite its blockstates suggesting otherwise
    • MC-269361 - Weird Wind Charge behavior when deflecting
    • MC-269373 - /datapack disable doesn't work
    • MC-269393 - Game crashes when wind charge hits entity
    • MC-269401 - The minecraft:set_written_book_pages item modifier is inconsistent with minecraft:set_name and minecraft:set_lore
    • MC-269409 - Unable to execute /particle entity_effect
    • MC-269419 - Heavy Core cannot be waterlogged
    • MC-269422 - Carpet on powder snow no longer negates fall damage
    • MC-269452 - Crash when using item modifier with replace_section mode and very large size field
    • MC-269457 - Crash with set_lore item modifier setting more than 256 lores
    • MC-269513 - Maces can break cobwebs

    Get the Snapshot

    Snapshots are available for Minecraft: Java Edition. To install the Snapshot, open up the Minecraft Launcher and enable snapshots in the "Installations" tab.

    Testing versions can corrupt your world, so please backup and/or run them in a different folder from your main worlds.

    Cross-platform server jar:

    Report bugs here:

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