Draft:Minecraft Version 26.4 Snapshot 1

Official Mojang Changelog

A Minecraft Java Snapshot

Welcome to the first snapshot of 26.4! We're kicking things off with a range of technical updates and improvements, including Vulkan becoming the default graphics API.

Changes

World Generation

Upgrading worlds from before Caves and Cliffs will now also generate sulfur caves below old chunks

Minor Tweaks to Blocks, Items and Entities

Red and Brown Mushrooms can now be placed on any block with a solid top face regardless of lighting conditions

They can still not spread unless the brightness is less than 13, or their support block overrides light requirements

"Graphics API" Video Setting

"Default" now behaves the same as "Prefer Vulkan"

The game will no longer change the graphics API setting automatically if a startup crash is detected.

Technical Changes

The Data Pack version is now 122.0

The Resource Pack version is now 98.0

Network Protocol

Added minecraft:mod_list Custom Packet Payload

This packet is intended to inform servers about client mods to simplify debugging

Vanilla client sends an empty packet at the start of configuration phase, as it does not know about any mods - that is still a responsibility of 3rd-party modding platforms

Modified minecraft:intention Packet

The host field in the serverbound intention packet can now hold additional parameters (previously it stored only the domain name used for connecting to a server)

The new format is similar to URI query strings - the domain can now optionally be followed by a ? character and then followed by key=value pairs separated by a & character

Empty values can be omitted (including = sign)

Keys and values are escaped according to the standard URI rules ("percent-encoded component")

Keys starting with _ are reserved for vanilla use

Example: example.com?key1=value2&key2

Users can now input properties in any "Server Address" field in the server list

Additionally, any address in form of <id>@<host> will be parsed as <host>?_id=<id>

If a server uses SRV DNS records, the host field will contain both original and resolved domains

If the resolved domain is different from the original domain, the resolved one will be used as the "primary" one, while the original one will be added as _o ("origin") property

Example host string: <redirected domain>?_o=<original domain>:<original port>, while the port field in the intention packet will be set to the resolved port value

The field size has been extended to 1024 characters

Note: since the minecraft:intent packet is unencrypted, properties should not be used for any security-sensitive purpose

Modified minecraft:transfer Packet

Added properties field - a string to string map of properties that will be added to the host field in the minecraft:intent packet sent to the target server

Dedicated Server Properties

Added allowed-connection-ids

A list of comma-separted ids

If non-empty, the server will match the values against _id property in minecraft:intent packet

If there is no match, the server will reject the connection

This works both for both status and login connections, so any user connecting without the correct _id in the server address will not see the status and will not be able to join the server

Added status-contact-details field

If non-empty, the value of this field will be sent in the minecraft:status_response packet JSON payload under the contact property

This value is meant to be used to signal a way to contact the server owners about the server, even if there is no website or other information about it

This field is meant to be human-readable, but there are no other restrictions on field format

Added enable-legacy-status field

This option allows disabling existing legacy (pre-1.7) server status and ping protocol handling

To preserve existing functionality, value defaults to true

Note: enable-status needs to be set for any status information (modern or legacy) to be set

Data Pack Version 122.0

Entries for different biomes in multi-noise biome sources can no longer overlap across all noise parameters with the same offset

Commands

The fillbiome command will now fill biomes with block accuracy

NBT conversion from floating point types to integer types now always converts to the closest possible valid number after rounding down

World Generation

Features

Changed straight_trunk_placer

Added trunk_width field

optional int provider, the width of the trunk centered around the origin

defaults to 1.0

Placed Features

The possible domain in the XZ plane of Placed Features included in biomes is now validated

Feature placement can only occur within a 3x3 chunk region: as such, it is not valid for a Placed Feature to select a position outside of that range

Note: the size of the feature itself is not currently taken into consideration, which may still overflow the chunk

Placement Modifiers

Changed cuboid

xz_size and y_size have been adjusted to represent the actual size of the cuboid, instead of implicitly being 1 block larger

As such, an xz_size of 2 will actually produce a 2x2 cuboid instead of 3x3

Changed fixed_placement

positions now requires at least one element

Noise Settings

The default_block field has been removed

This is now always air - any other block should be defined by the Material Rule

Material Conditions

Updated minecraft:steep

No longer considers height modifications from Eroded Badlands "surface extensions" in an order-dependent way

Tags

Biome Tags

Added #generated_in_below_zero_retrogen - biomes to generate below worlds that predate Caves and Cliffs

Added #is_cave collection tag

Resource Pack Version 98.0

Shaders & Post-process Effects

Order-Independent Transparency shaders

The OIT algorithm was simplified by replacing the wavelet-based mathematics with depth bin-based accumulation

Slightly improved performance at least on some devices

Reduced floating point precision issues on average

OIT_WAVELET_RANK shader define was removed

OIT_COEFF_COUNT shader define was replaced by OIT_NUMBER_OF_DEPTH_BINS

OIT_COEFF_ATTACHMENT_COUNT shader define was renamed to OIT_TRANSMITTANCE_TARGET_COUNT

Fixed bugs in 26.4 Snapshot 1

MC-8959 - The player automatically jumps when pressing against a block while in water

MC-44560 - When pushed to the edge of water or lava, entities jump by themselves

MC-50749 - Jumping into water against a wall causes the player to bounce

MC-123848 - Item frames (and items within) drop atop the block they're attached to instead of under it when removed from a ceiling

MC-135211 - Entities automatically jump when falling into 1-block-deep water from certain heights

MC-135212 - Entities automatically jump when falling into water of any depth from certain heights

MC-262252 - The generation of lush caves and dripstone caves is poorly defined

MC-276879 - /data truncates floats when casting to longs, but rounds down in all other cases

MC-278651 - The host name in handshake packets for SRV records is inconsistent

MC-296053 - Item frames don't update properly when modifying their Facing NBT tag

MC-299060 - Setting item frames' direction with commands can cause desyncs

MC-303702 - Small gaps still appear in item models

MC-307065 - Missing optimization for the side faces of the builtin/generated item model

MC-310051 - Floating point cancellation artifacts from bits.fsh

MC-310131 - Placeable entities momentarily appear at the wrong location when placed

MC-310767 - Pipelines always declare a D32_FLOAT depth attachment format with the Vulkan rendering backend

MC-311195 - Placed armor stands are rotated incorrectly for one tick

MC-311265 - The world border renders incorrectly from outside

MC-311473 - Duplicating items with the scroll wheel in Creative mode can produce ghost items

MC-311582 - The texture of desert pyramid maps has one inconsistent pixel compared to the others

MC-311726 - The water inside waterlogged copper grates has the falling fluid state property set to true

MC-311727 - The check for whether a player is standing on air doesn't use the player's updated position

MC-311773 - Red and brown mushrooms cannot be placed at any light level, unlike in Bedrock Edition

MC-311786 - Running /test run with a rotationSteps value that is out of range causes an error

MC-311788 - Teleporting item frames moves them further than it should visually

MC-311818 - Traveling to the End in Spectator mode regenerates the obsidian platform

MC-311836 - Minecart sounds are now distorted

MC-311859 - Damaged dyed wolf armor no longer shows cracks in the colored parts

MC-311966 - The tooltip of the "Quit Shortcuts" option calls the Command key "Cmd"

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.

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