Minecraft snapshot 25w04a patch notes: Movement nerf reverted, technical changes, and bug fixes

On January 22, 2025, Mojang released Minecraft snapshot 25w04a for Java Edition. Fans hoping for new feature additions might be disappointed, as this snapshot primarily includes technical changes and bug fixes. On the bright side, the developers have decided to revert the movement nerfs introduced in last week's snapshot.

The movement nerfs had negatively impacted players who engage in parkour and speed bridging in Minecraft. After many players voiced concerns about the changes, the developers decided to revert them.

The new Minecraft snapshot also adds language support for Kyrgyz. Aside from this, it includes numerous technical changes and bug fixes. Let's go through the patch notes for Minecraft snapshot 25w04a.

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Minecraft snapshot 25w04a patch notes

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New Features

Added language support for Kyrgyz

Changes

Reverted fixes:
MC-271065 - Diagonal movement is not normalized when crouching or using certain items
MC-152728 - The player continues sprinting when performing actions that slow them down

Developer's Note: After consideration, we have decided to revert both fixed bugs. While we do want to revisit these mechanics in the future, it's clear that these recent fixes alone didn't quite hit the mark and caused too many negative side-effects for parkour, speedbridging, and movement in general

Crossbows will now show all charged projectiles in their tooltip instead of just the first
All charged projectiles will also add their entire tooltip as a subsection, instead of only Fireworks
All container items with stored contents, such as a Chest picked with Ctrl+Pick Block, will now list the first 4 items in their tooltip just like Shulker Boxes

Technical Changes

The Data Pack version is now 64
The Resource Pack version is now 49

Data Pack Versions 64

The potion entity type has been split into splash_potion and lingering_potion
Filled Maps without any map_id component no longer show an 'Unknown Map' tooltip (invalid IDs will still produce this tooltip)
Trim pattern and trim material items are no longer specified in the trim registries, but instead in the recipes and items respectively
Field background in advancement definition no longer contains textures/ prefix and .png suffix
Changes to entity variant definitions
Cat and Frog variants are now data-driven
Added uniform way to define variant selection rules

Commands

SNBT literals now accept heterogenous lists

SNBT changes

SNBT (textual representation of NBT-like data) has been expanded to accept heterogenous lists, i.e. ones where elements are not of the same type
NBT format is not changed
If SNBT command argument transforms value to NBT (like arguments of /data or /summon), lists might be transformed to bypass NBT constraints
Example transform: ['a', {'b':3}] is stored as [{'':'a'},{'b':3}]
This transform is not reversed by /data

Developer's Note: Internally, in new code we read and write data in both JSON and NBT formats. This change makes sure that we don't have to worry about NBT limitations when it comes to lists. We have chosen to not expand NBT itself to avoid breaking existing external tools.

Uniform variant selection

Variants that have spawn rules now use uniform approach for selecting
Selection process:
Every variant field spawn_conditions that contain a list of entries
Every entry has a condition and an integer priority
Conditions for all variants for given entity type are evaluated for position where entity is being spawned
Entries with priority lower than maximum priority of remaining entries are removed
Game randomly picks one entry out of remaining ones
If no conditions are remaining, variant remains unchanged from default
Entry format:
priority - integer
condition - optional structure
Fields:
type - see below for values
Additional fields dependent on type
If field is not present, condition is always true

Spawn conditions

minecraft:biome

Checks if entity is spawning in specific biomes
Fields:
biomes - single entry, list or a tag describing biomes

minecraft:moon_brightness

Checks if current moon brightness is within certain range
Fields:
range - floating point range (a single number or an object like {"min": 1, "max": 2})

minecraft:structures

Checks if entity is spawning in specific structures
Fields:
structures - single entry, list or a tag describing structures

Wolf Variants

Fields angry_texture, tame_texture and wild_texture have been grouped in field assets and renamed to angry, tame and wild
Added field spawn_conditions described in uniform variant selection above

Pig Variants

texture and biome fields are replaced with asset_id and spawn_conditions respectively.
Fields in file:
asset_id - namespaced id for this variant asset, resolves to assets/<namespace>/textures/<path>.png
spawn_conditions - field described in uniform variant selection above

Cat variants

Cat variants can be data-driven by adding entries to data/<namespace>/cat_variant/<id>.json
This feature is experimental
Fields in file:
asset_id - namespaced id for this variant asset, resolves to assets/<namespace>/textures/<path>.png
spawn_conditions - field described in uniform variant selection above

Frog variants

Frog variants can be data-driven by adding entries to data/<namespace>/frog_variant/<id>.json
This feature is experimental
Fields in file:
asset_id - namespaced id for this variant asset, resolves to assets/<namespace>/textures/<path>.png
spawn_conditions - field described in uniform variant selection above

Item Components

New

weapon

component

can_disable_blocking field is replaced with disable_blocking_for_seconds
disable_blocking_for_seconds - non-negative float (default: 0)
If non-zero, will disable a blocking Shield on successful attack for the specified amount of seconds

New

blocks_attacks

component

When present, this item can be used like a Shield to block attacks to the holding player
Format: object with fields:
block_delay_seconds - non-negative float (default: 0)
The number of seconds that right-click must be held before successfully blocking attacks
disable_cooldown_scale - non-negative float (default: 1)
Multiplier applied to the number of seconds that the item will be on cooldown for when attacked by a disabling attack (disable_blocking_for_seconds on the weapon component)
If 0, this item can never be disabled by attacks
damage_reductions - list of object with fields (optional)
Controls how much damage should be blocked in a given attack
If not specified, all damage is blocked
Each entry in the list contributes an amount of damage to be blocked, optionally filtered by damage type
Each entry adds to blocked damage, determined by clamp(base + factor * dealt_damage, 0, dealt_damage)
The final damage applied in the attack to the entity is determined by dealt_damage - clamp(blocked_damage, 0, dealt_damage)
Entry format:
type - damage type id, list of damage type ids, or hash-prefixed damage type tag (optional)
This entry will only contribute to the blocked damage if the dealt damage type matches this field
If not specified, any damage type will be accepted
base - float
Constant amount of damage to be blocked
factor - float
Fraction of the dealt damage that should be blocked
item_damage - object with fields (optional)
Controls how much damage should be applied to the item from a given attack
If not specified, a point of durability is removed for every point of damage dealt
The final damage applied to the item is determined by: floor(base + factor * dealt_damage)
The final value may be negative, causing the item to be repaired
Format:
threshold - non-negative float
The minimum amount of damage dealt by the attack before item damage is applied to the item
base - float
Constant amount of damage applied to the item, if threshold is passed
factor - float
Fraction of the dealt damage that should be applied to the item, if threshold is passed
block_sound - sound event (optional)
If specified, this sound will be played when an attack is successfully blocked
disable_sound - sound event (optional)
If specified, this sound will be played when the item goes on its disabled cooldown due to an attack

New

break_sound

component

When present, this sound will be played when the item runs out of durability and breaks
If not present, no sound will be played on break
This component is present by default on every item type
Format: sound event
e.g. break_sound='item.wolf_armor.break'

New

provides_banner_patterns

component

When present, this item can be placed in the pattern slot of a Loom
Format: hash-prefixed banner pattern tag
e.g. provides_banner_patterns='#minecraft:pattern_item/globe'

New

provides_trim_material

component

When present, this item will provide the specified trim material when used in a trimming recipe
Note that to be used in the built-in smithing recipes, the item must also be in the #trim_material tag
As such, the trim material registry definition no longer specifies an item
Format: trim material id
e.g. provides_trim_material='minecraft:iron'

Entity components

Some existing components are now also transferred from spawning item to spawned entity:
minecraft:custom_name - any entity
minecraft:potion_contents - Lingering Potion to Area Effect Cloud
minecraft:potion_duration_scale - Lingering Potion to Area Effect Cloud

New

tooltip_display

component

This component allows the tooltips provided specifically by any given item component to be surpressed
This replaces the previous show_in_tooltip fields, hide_additional_tooltip and hide_tooltip components
Format: object with fields:
hide_tooltip - boolean (default: false)
If true, the item will have no tooltip when hovered
hidden_components - list of item component ids (default: [])
The tooltips provided by any component in this list will be hidden
If that component provides no tooltip, it will have no effect

Removed

hide_additional_tooltip

Component

Replaced by use of the tooltip_display component and hidden_components field
The following components previously covered by the hide_additional_tooltip component may need to be hidden:
minecraft:banner_patterns
minecraft:bees
minecraft:block_entity_data
Specifically, Mob Spawner and Trial Spawner block entity data will display the configured mob
minecraft:block_state
Specifically, the honey_level property will be displayed in the tooltip for any item with this specified
minecraft:bundle_contents
minecraft:charged_projectiles
minecraft:container
minecraft:container_loot
minecraft:firework_explosion
minecraft:fireworks
minecraft:instrument
minecraft:map_id
minecraft:painting/variant
minecraft:pot_decorations
minecraft:potion_contents
minecraft:tropical_fish/pattern
minecraft:written_book_content
This additionally means that tooltips from the above listed components are no longer restricted to specific item types
Note: for existing items in a world with the hide_additional_tooltip component, any of the above listed components also present on the same item will be added to the list to hide in tooltip_display

Removed

hide_tooltip

Component

Replaced by use of the tooltip_display component and hide_tooltip field

attribute_modifiers

Component

Removed show_in_tooltip field, replaced by tooltip_display component
This component now always uses its simplified form, with the modifiers field inlined to top-level
e.g. attribute_modifiers={modifiers:[...]} -> attributes_modifiers=[...]

dyed_color

Component

Removed show_in_tooltip field, replaced by tooltip_display component
This component now always uses its simplified form, with the rgb field inlined to top-level
e.g. dyed_color={rgb:12345} -> dyed_color=12345
The specified color now supports the RGB array format
e.g. dyed_color=[0.5, 1.0, 0.2]

can_place_on

and

can_break

Components

Removed show_in_tooltip field, replaced by tooltip_display component
The predicates field has been inlined to top-level, and supports either a single element or list
e.g. can_place_on={predicates:[{blocks:'stone'},{blocks:'dirt'}]} -> can_place_on=[{blocks:'stone'},{blocks:'dirt'}]
or: can_place_on={predicates:[{blocks:'stone'}]} -> can_place_on={blocks:'stone'}

enchantments

and

stored_enchantments

Components

Removed show_in_tooltip field, replaced by tooltip_display component
These components now always use their simplified form, with the levels field inlined to top-level
e.g. enchantments={levels:{sharpness:2}} -> enchantments={sharpness:2}

jukebox_playable

Component

Removed show_in_tooltip field, replaced by tooltip_display component

trim

Component

Removed show_in_tooltip field, replaced by tooltip_display component

unbreakable

Component

Removed show_in_tooltip field, replaced by tooltip_display component

Particles

The particle type tinted_leaves now has a parameter:
color: Tint color, specified either as packed int or list of 4 floats

Recipes

smithing_transform

Recipe Type

The base ingredient field is no longer optional
Previously, if no base ingredient was given, the recipe would parse but never be useable

smihing_trim

Recipe Type

The base, template, and addition ingredient fields are no longer optional
Previously, if these ingredients were not given, the recipe would parse but never be useable
Added new pattern field, controlling which trim pattern will be applied in the recipe
As such, the trim pattern registry definition no longer specifies the item
Format: trim pattern id
e.g. "pattern": "minecraft:bolt"

Trim Patterns and Trim Materials

The registry definitions for trim patterns and trim materials no longer include an item field
Instead, this mapping in patterns and materials is defined by the recipe and item components respectively

Loot Functions

toggle_tooltips

Now supports any component id in the toggles map
Any component specified will be toggled in the tooltip_display component

Resource Pack Version 49

Item Models

minecraft:component

Select Property

If the selected value comes from a registry and the current datapacks does not provide it, the entry will be silently ignored
In previous snapshot, unrecognized elements caused the whole item model to be ignored

minecraft:component

Boolean Property

New conditional model property has been added to condition item model: component
Uses component predicates (like ones used in item predicates) to match item components
However, instead of encoding them as a map of <predicate type>:<predicate value>, a single predicate is encoded in two fields
Fields:
predicate - type of component predicate (member of minecraft:data_component_predicate_type registry)
value - predicate-specific value

Atlas

minecraft:paletted_permutations

sprite source

New field:
separator - optional string (default: _) - value to be used when joining texture and permutation names to produce sprite name

Fixed bugs in Minecraft snapshot 25w04a

MC-98271 - The sound of blocking with a shield is only hearable by other players (not the person blocking)
MC-165421 - Bubble columns have the opposite effect on wind charges
MC-165461 - Crossbow loading animation stops after loading, even when still holding down right click
MC-255756 - When the shield is broken between players, the attacking side has no shield breaking sound
MC-276061 - Decorated pot sherds don't visually update until relog when replacing with blank pot
MC-278400 - Arrows and tridents move after hitting a block in flowing lava
MC-279217 - Arrows and tridents constantly spin after hitting a block in flowing lava
MC-279218 - The minecraft:enchant.thorns.hit sound does not play when mobs or players are killed by the Thorns enchantment
MC-279225 - Players jitter and land slightly too high up when landing on powder snow while wearing leather boots
MC-279232 - SNBT text components prevent mixing text styles in lists
MC-279389 - The minecraft:entity.arrow.hit_player sound is played when player is hit by an arrow shot by himself
MC-279454 - hide_additional_tooltip no longer hides author and generation on written books
MC-279480 - The "test_instance_block.reset_success" string incorrectly spells the word "succeeded" as "succeded"
MC-279481 - Leaf litter no longer generates in forests or wooded badlands
MC-279482 - Elements within the test block and test instance block menus are not selected in order when using the TAB key
MC-279483 - Test blocks set to start mode show the "Message:" text despite no text field being present
MC-279485 - Test block and test instance block menus have blurred backgrounds
MC-279486 - Some strings displayed within the test instance block interface are untranslatable
MC-279487 - The "Test Instance ID" and "Test Structure Size" text within the test instance block interface are positioned too far to the right
MC-279488 - Leaf litter generates very sparsely in Dark Forests
MC-279489 - An unexpected error occurs when attempting to create tests with large sizes
MC-279490 - No command feedback messages are displayed when attempting to reset tests that don't exist
MC-279491 - The "commands.test.no_tests" raw translation key is displayed when using "/test run..." commands in situations where no tests exist
MC-279492 - An unexpected error occurs when attempting to locate tests that don't exist
MC-279493 - No command feedback messages are displayed when using the "/test create" command
MC-279498 - Test blocks and test instance blocks aren't part of the "#minecraft:dragon_immune" or "#minecraft:wither_immune" tags
MC-279502 - Axolotl variants are no longer saved when bucketing
MC-279504 - "minecraft:enchantments" component does not work on the select property of Item Models
MC-279505 - Horse-esque mobs that disallow horse armor still show an non-interactive slot
MC-279511 - Using "minecraft:always_pass" while the player is inside the test zone breaks the world
MC-279518 - Test environment accepts minecraft:raining instead of minecraft:weather
MC-279519 - Some words within some test command strings are always pluralized
MC-279522 - GameTest entrypoint doesn't load zip datapacks
MC-279527 - GameTest entrypoint doesn't load custom tests from datapacks
MC-279538 - The key name of the test instances field that represents the namespaced ID of the test environment is different from the changelog
MC-279539 - Villager variant is not applied to spawned zombie villagers
MC-279553 - Players using items no longer turn their body in the moving direction while moving diagonally
MC-279570 - Some piston operations don't send neighbor updates
MC-279573 - The "test_instance_block.error.no_test" string is missing the word "no"
MC-279588 - Test instance field typo 'sky_accesss'
MC-279599 - /test pos is offset by one on the y and z axis
MC-279601 - "test.error.expected_entity_at_pos" translation is missing
MC-279646 - Toggling fullscreen with F11 does not visually update the fullscreen option in the video settings menu
MC-279653 - Block Entity Data desynchronizes after subsequent setblock commands

The highlight of Minecraft snapshot 25w04a is the reversal of the controversial movement nerf, addressing a key concern for players. Beyond that, the technical changes provide valuable tools for players working on data packs, and the bug fixes contribute to a smoother and more polished gameplay experience.

This snapshot may not introduce flashy new features, but it reinforces Mojang's commitment to improving the game's core mechanics and listening to player feedback.