Mojang has a new patch out for Minecraft Preview, and it’s another one packed to the brim with various fixes and adjustments. Thsose on consoles will see this as Minecraft Preview update 1.38, and version 1.023 on current-gen. There’s a lot to take in with this patch which Mojang calls 1.21.40.21, so dive into the changelog.

Minecraft Preview Update 1.38/1.023 Patch Notes:

Experimental Features

Bundles

• Renamed Bundles names are now italicized in the tooltip (MCPE-185502)

Features and Bug Fixes

Accessibility Features

• Re-implemented the left handed mode on touch devices for accessing the inventory from the hotbar (MCPE-179608)

Blocks

• Fixed an issue with shipwrecks only generating lower-slabs. (This fix will not alter already generated shipwrecks) (MCPE-186235)
• Updated references to old block names in behavior pack wood recipe files
• Updated references to old block names in remaining behavior pack recipe files

Gameplay

• Fixed a bug where Oozing, Weaving, and Wind Charged effects did not apply on player’s death (MCPE-180640)
• Mobs can now perform Mace Smash attacks

General

• Removed some Keyboard key bindings from Settings that should only exist in Minecraft Education: Control Tips, Code Builder, and Immersive Reader

Graphical

• Fixed an issue that caused some blocks to lose their ambient occlusion and for leaves in certain biomes to appear too bright (MCPE-186343)

Mob

• Carved Pumpkin and Skull now rotates with the Bogged’s head when worn (MCPE-178959)

Sound

Blocks

• Mob Spawner step sounds and hit sounds now play at their intended volume
• Trial Spawner hit sounds now play at their intended volume

Mobs

• Wither Skeleton step sounds now play at their intended volume (MCPE-185913)

User Interface

• LAN worlds are now visible in the “Worlds” tab for the OreUI Play screen (Preview only)
• Fixed a bug where the incorrect message would be shown on the experimental bed screen for certain values of the playerssleepingpercentage game rule (MCPE-183431)

Creative Inventory Changes

Developer’s Note: Items and blocks in the creative inventory have been reorganized, with the goal of making overall sorting more intuitive.

• Trial Chamber items
  • Trial Keys were moved to be next to Ominous Trial Keys, very ominous (MCPE-180280)
  • Ominous Bottles were moved next to the existing Potions and were made into its own “Ominous Bottle” group (MCPE-180278 )
• Stone group in the Nature tab
  • Stone was moved into the Stone group, finally (MCPE-116364)
  • Stone is now the front block of the Stone group
  • Basalt and Smooth Basalt were moved into the Stone group
  • Tuff and Polished Tuff were moved into the Stone group (MCPE-176383)
• Decorative Stone in the Construction tab
  • Smooth Stone was moved into Decorative Stone
  • Tuff Brick, Chiseled Tuff, and Chiseled Tuff Bricks were moved from the Nature Category to Decorative Stone in the Construction Category
  • Prismarine Bricks were moved from the Decorative Stone group, now they are next to Prismarine and Dark Prismarine
• Copper family etc. (MCPE-176384)
  • Reordered Raw Iron, Raw Copper, Raw Gold to Raw Copper, Raw Iron, Raw Gold
  • The Copper, Iron, and Gold blocks were moved to match the Raw versions ordering
  • The Copper Doors were moved to all the other Doors
  • The Copper Trapdoors were moved to the group with all the other Trapdoors, this is not a trap
  • Copper Blocks and Copper Grates are now sorted by Block type then by Oxidation level, instead of Oxidation level then Block type
• Tuff family
  • Tuff Stairs, Tuff Slabs, Tuff Walls, and their polished versions were moved from the Nature tab to the Construction Tab into their respective groups
• Other blocks
  • Bricks are now placed before the Slabs group
    • This change only affects Bricks made from Clay and not all the brick blocks
  • Chiseled Nether Bricks and Cracked Nether Bricks were moved next to the Nether Brick Block and Red Nether Brick
  • Quartz Bricks placed next to the other Quartz blocks
  • Rooted Dirt is now next to the other Dirt blocks
  • Many Dirt blocks and Grass variants were shuffled around to match Java Edition
  • Gravel is now ordered after the Stone group and is next to Sand and Red Sand
  • Clay was moved from the Construction Category to the Nature Category, placed next to the Mud Block

Technical Updates

Block

• Added content warning when “carried_textures” or “blockshape” are incorrectly written in blocks.json

Components

• Renamed the “minecraft:lookat” component to “minecraft:looked_at” to better reflect its functionality
  • Its “look_event” field was also renamed to “looked_at_event”
  • Its “look_cooldown” field was also renamed to “looked_at_cooldown”
• Expanded the “minecraft:looked_at” component functionality with the addition of six new [Beta] fields:
  • “find_players_only” restricts the search for entities looking at the owner entity to Players only, ensuring that the closest Player satisfying the specified “filters” is selected
  • “look_at_locations” defines the parts of the owner entity that are targeted for being looked at
    • For these parts, a line-of-sight check is performed to ensure no blocks obstruct the view
    • Supported values are “head”, “body”, and “feet”
  • “not_looked_at_event” specifies the event to trigger when no suitable entity is looking at the owner entity
  • “field_of_view” defines the width of the field of view, in degrees, for entities looking at the owner entity:
    • If “scale_fov_by_distance” is set to true, this value corresponds to the field of view at a distance of one block between the entities
  • “scale_fov_by_distance” determines if the field of view narrows as the distance between the owner entity and the entity looking at it increases
    • This ensures that the width of the view cone at the owner entity position remains relatively constant, regardless of distance
  • “line_of_sight_obstruction_type” defines which block shape is considered when checking for line-of-sight obstructions
    • Supported values are “outline,” “collision,” and “collision_for_camera”
  • Moreover, “set_target” now supports three different values:
    • “never”, looking entities are never set as targets, but events are emitted
    • “once_and_stop_scanning”, the first detected looking entity is set as target, but scanning and event emission is suspended if and until the owner entity has a target
    • [Beta] “once_and_keep_scanning”, the first detected looking entity is set as target, but scanning and event emission continues
  • All these fields are planned to be taken out of [Beta] and fully released at a later date

Editor

• Added an initial Editor Settings panel with options for ‘Show Invisible Blocks’ and ‘Show Chunk Boundaries’

Entity Event Responses

• Added the “reset_target” entity event response, which allows an entity to reset its target

Feature

• Using unsupported feature placement in “pregeneration_pass” will now throw a content error instead of crash

Graphical

• Add new the_end.client_biome.json as the first new type of file to contain per-biome rendering and audio settings in resource packs

Items

• The "minecraft:item" object is parsed with a strict loader from 1.21.40
  • Numbers and booleans are no longer interchangeable in the JSON input
  • Floating point numbers are no longer accepted where an integer is expected

Resource and Behavior Packs

• Fixed an issue where packs were not downloaded or applied when joining a server that had CDN enabled
• Fixed an issue where user choice for downloading/applying resource packs during server join was ignored when CDN is enabled on the server

Trading

• Fixed an issue where trades with negative ‘max_use’ values could not be traded

Technical Experimental Updates

Graphical

• Improved lighting for maps when held in hand and when placed in frames in the Deferred Technical Preview
• Fixed water surface shaking that would occur when upscaling was enabled in the Deferred Technical Preview
• Added a slider in the Deferred Technical Preview video settings for controlling the upscaling resolution factor

Molang

• Adding under upcoming creator features:
  • query.client_memory_tier. Returns a number representing the client RAM memory tier, 0 = ‘Undetermined’, 1 = ‘SuperLow’, 2 = ‘Low’, 3 = ‘Mid’, 4 = ‘High’, or 5 = ‘SuperHigh’. Available on the Client (Resource Packs) only
  • query.server_memory_tier. Returns a number representing the server RAM memory tier, 0 = ‘Undetermined’, 1 = ‘SuperLow’, 2 = ‘Low’, 3 = ‘Mid’, 4 = ‘High’, or 5 = ‘SuperHigh’. Available on the server side (Behavior Packs) only

Scripting

• Added enum MemoryTier

    export enum MemoryTier {
        Undetermined = 0,
        SuperLow = 1,
        Low = 2,
        Mid = 3,
        High = 4,
        SuperHigh = 5
    }

• Added base class SystemInfo
  • Field MemoryTier
• Added class ClientSystemInfo.
  • Field MemoryTier
• Class Player
  • Added property clientSystemInfo
• Class System
  • Added property serverSystemInfo

[Source: Minecraft]