Snapshot 25w09b

Back so soon! We’re releasing a second snapshot this week, following frequently occurring issues in yesterday’s snapshot.

Happy mining!

Fixed bugs in 25w09b

• MC-280302 – Text does not render in menus until entering a world
• MC-280303 – Game crashes when trying to render a warden
• MC-280305 – GUI elements incorrectly overlap on macOS
• MC-280308 – Crash from GL error when opening world
• MC-280310 – The game crashes near a Trial Chamber
• MC-280322 – Game crashes when trying to render a breeze
• MC-280324 – Game crashes when entering the end from the nether
• MC-280329 – Game sometime crashes when saving world
• MC-280334 – The Report Player screen is broken
• MC-280346 – The loading screen initially appears black and only changes to red at the end

Snapshot 25w09a

New Features

• Added fallen trees to be in parity with Bedrock Edition

Fallen Trees

• Fallen trees are a new decorative variant of trees
• Fallen trees come in four different wood type variants:
  • Oak
  • Birch
  • Jungle
  • Spruce
• Birch fallen trees can come in a shorter version or a longer version
• Some fallen trees can be decorated with mushroom or vines
• Fallen trees can be found in all biomes where their standing tree variant grow, except the following:
  • Meadow
  • Bamboo Jungle
  • River
  • Grove
  • Flower Forest has fallen birch trees but not fallen oak trees

Changes

Leaf Litter

• Leaf Litter is now replaceable by other blocks

Firefly Bush

• The Firefly Bush can now generate near water in Mangrove Swamps and Badlands (very rarely), like other biomes with water

Technical Changes

• The Data Pack version is now 69
• New command line argument –renderDebugLabels is available for the client
  • Adds debug labels to relevant OpenGL objects, making debugging rendering easier for developers

Data Pack Version 69

• Object notation used in commands for NBT, text components and inline predicates (a.k.a. SNBT) has been extended

Commands

• /data can now create and modify heterogeneous lists transparently

Entity Data

• The FallFlying field will no longer be preserved if removed
• The Health and Air fields now default to their respective maximum value if not specified

area_effect_cloud

• The Duration field now defaults to -1 if not specified
• If the Duration field is -1, the Area Effect Cloud will never run out
• This means that an Area Effect Cloud summoned with no duration specified will no longer immediately disappear

creeper

• The Fuse field now defaults to 30 if not specified
• The ExplosionRadius field now defaults to 3 if not specified

dolphin

• The Moistness field now defaults to 2400 if not specified

ender_dragon

• The DragonDeathTime field now defaults to 0 if not specified

falling_block

• The HurtEntities field now defaults to false if not specified (or true if BlockState is anvil)
• The FallHurtAmount field now defaults to 0 if not specified
• The FallHurtMax field now defaults to 40 if not specified
• The DropItem field now defaults to true if not specified
• The TileEntityData field will no longer be preserved if removed

firework_rocket

• The ShotAtAngle field now defaults to false if not specified

fox

• The Trusted field now defaults to empty if not specified (and will no longer be merged with the previous state if modified by /data)

ghast

• The ExplosionPower field now defaults to 1 if not specified

goat

• The HasLeftHorn and HasRightHorn fields now default to true if not specified

interaction

• The width and height fields now default to 1 if not specified

item

• The Health field now defaults to 5 if not specified
• The PickupDelay field now defaults to 0 if not specified
• The Age field now defaults to 0 if not specified
• The Owner and Thrower fields will no longer be preserved when removed

item_frame and glow_item_frame

• The ItemDropChance field now defaults to 1.0 if not specified

primed_tnt

• The fuse field now defaults to 80 if not specified
• The explosion_power field now defaults to 4 if not specified

shulker

• The Color field now defaults to 16 (no color) if not specified

skeleton

• The StrayConversionTime field will no longer be preserved when removed

spectral_arrow

• The Duration field now defaults to 200 if not specified

snow_golem

• The Pumpkin field now defaults to true if not specified

tnt_minecart

• The fuse field now defaults to 80 if not specified
• The explosion_power field now defaults to 4 if not specified
• The explosion_speed_factor field now defaults to 1 if not specified

trader_llama

• The DespawnDelay field now defaults to 47999

villager

• The FoodLevel and Xp fields now default to 0 if not specified
• The ConversionTime field will no longer be preserved when removed

wandering_trader

• The DespawnDelay field now defaults to 0 if not specified

zombie

• The DrownedConversionTime field will no longer be preserved when removed

zombie_villager

• The Xp field now defaults to 0 if not specified
• The ConversionTime field will no longer be preserved when removed

arrow, spectral_arrow, trident

• The damage field now defaults to 2 if not specified

dragon_fireball, wind_charge, breeze_wind_charge, wither_skull, small_fireball, and large_fireball

• The acceleration_power field now defaults to 0.1 if not specified

small_fireball and large_fireball

• The ExplosionPower field now defaults to 1 if not specified

block_display, item_display, and text_display

• The interpolation_duration, teleport_duration, and start_interpolation fields now default to 0 if not specified
• The view_range field now defaults to 1 if not specified
• The shadow_radius field now defaults to 0 if not specified
• The shadow_strength field now defaults to 1 if not specified
• The width and height fields now default to 0 if not specified

Block Entity Data

campfire

• The CookingTimes and CookingTotalTimes fields will no longer be preserved when removed

chiseled_bookshelf

• The last_interacted_slot field now defaults to -1 if not specified

hopper

• The TransferCooldown field now default to -1 if not specified

jigsaw

• The name, target, and pool fields now default to minecraft:empty if not specified
• The final_state field now defaults to minecraft:air if not specified

sculk_shrieker

• The warning_level field now defaults to 0 if not specified

structure_block

• The ignoreEntities and showboundingbox fields now default to true if not specified
• The posY field now defaults to 1 if not specified

NBT Changes

• Any interface with NBT data within the game (SNBT representation, /data) now supports heterogeneous lists, i.e. ones where elements are not of the same type
  • Inserting or replacing into a list of a different type with /data will no longer give an error
  • Inserting into an array type (e.g. [I;1,2,3]) is still type-restricted
  • This means that the ‘wrapper’ objects previously used to represent heterogeneous lists will no longer be observable by in-game means
• /data can no longer traverse paths with an empty key (e.g. /data get … foo.”.bar)
• The NBT file format is unchanged:
  • Heterogeneous lists are transformed before storage to bypass NBT constraints
  • Example transform: [‘a’, {‘b’:3}] is stored as [{”:’a’},{‘b’:3}]
  • Existing external tools will still be able to read NBT files as before, but heterogeneous lists will be displayed in the transformed form
• No data produced by the game has changed: objects such as Text Components were already producing heterogeneous lists in this form
• Note: these wrapper objects may never be observed in-game, they are only relevant to developers working with the NBT file or network format directly

SNBT Changes

• The text format for describing object-like data in commands (like NBT, text components, predicates, etc.) has been extended

Number Format

• Either whole or fraction parts of a float number can be omitted
  • Examples: .1 and 1. are valid now
• Float numbers now use E notation
  • Example: both 1.2e3 and 1.2E3, 1.2E+3, 12000e-1 are now a valid way to represent 1200.0
• Integer numbers can now be prefixed with 0x to represent hexadecimal numbers and 0b to represent binary numbers
  • Example: 0xbad (equal to 2989), 0xCAFE (equal to 51966), 0b101 (equal to 5)
• Integer numbers now can’t start with 0
  • Normally it would mean number is in base-8, but we are restricting it to avoid accidental use
• Numbers can now contain _ character between sequences of digits (but not at the start or the end of sequence)
  • Example: 0b10_01, 0xAB_CD, 1_2.3_4__5f, 1_2e3_4
• NaN, Inf or hexadecimal float representation are NOT supported
• Type suffixes have been extended:
  • Integer type suffixes (b or B – byte, s or S – short, i or I – integer, l or L) can now be prefixed with s (signed) or u unsigned
  • New suffixes only affect valid range when parsing – values are still stored as signed
    • Example: 240ub is equal to -16sb, while 240sb does not parse
  • When a suffix is used without u or s, it defaults to signed for decimal numbers and unsigned for binary and hexadecimal numbers
  • Note: since b is also a valid hexadecimal digit, byte sized hexadecimal values can only be written with a signed suffix, like 0x11ub or 0x11sb

Strings

• Quoted strings can now use escape sequences beyond ‘, “ and \:
  • Unicode escapes:
    • \x – two digit escape, like \x42
    • \u – four digit escape, like \u2603
    • \U – eight digit escape, like \U00002603
    • \N{<name>} – named Unicode character, like \N{Snowman}
  • Built-in escape sequences:
    • \b – backspace, Unicode \x08
    • \s – space, Unicode \x20
    • \t – horizontal tab, Unicode \x09
    • \n – linefeed, Unicode \u0a
    • \f – form feed, Unicode \u0c
    • \r – carriage return, Unicode \u0d
• Unquoted strings now can’t start with 0-9, ., +, – to avoid accidental collision with numbers

Number Arrays

• Values in arrays ([B;], [I;], [L;]) without a suffix are now assumed to have suffix matching the type of the array
  • Example: [B;1,2] is equivalent to [B; 1b, 2b]
• Arrays can now also accept types smaller than the array type
  • Example: [I;1b,2s,3] is valid and equivalent to [I;1i,2i,3i]

Lists

• Lists now accept trailing commas
  • Example: [1,2,] is valid and equivalent to [1,2]
  • Only one trailing comma is allowed, and it must come after a valid element – both [,] and [1,,] are invalid

Compounds

• Compounds (maps) now accept trailing commas
  • Example: {a:b,}
  • Only one trailing comma is allowed, and it must come after a valid key-value pair – both {,} and {a:b,,} are invalid

Fixed bugs in 25w09a

• MC-168262 – Dead bushes cannot be placed on farmland
• MC-236100 – End crystal beam appears to be black
• MC-276861 – The player can sometimes teleport through blocked end portals when moving very fast
• MC-279229 – SNBT text components prevent \n and \t from working
• MC-279236 – Flying into water with an elytra puts the player into an erroneous state
• MC-279250 – SNBT text components prevent unicode escapes from working
• MC-279252 – Changing a single line of a sign with /data is no longer possible in some situations
• MC-279278 – Strafing twice in rapid succession while walking forward causes player to sprint
• MC-279928 – Beacon beam clips into beacon block when far enough away
• MC-279932 – Beacon beam disappears and reappears when approaching it
• MC-279942 – Beacon beam can render over fog when outside render distance
• MC-279947 – Snout of the new cow model is offset vertically by 0.1 pixels
• MC-280022 – Players can be lit by lava while stepping onto solid blocks next to it
• MC-280033 – Beacon beams render beyond client render distance
• MC-280121 – Leaf litter can be placed on walls and fences
• MC-280123 – Short dry grass and tall dry grass aren’t randomly offset, unlike similar blocks
• MC-280155 – Random ticks can cause entity build-up in lazy chunks
• MC-280170 – Goats can no longer ram armor stands unless the game rule mobGriefing is set to false
• MC-280211 – End crystal beams cause OpenGL errors with glDebugVerbosity set to 3