Java Edition 1.21.6 Pre-Release 1

Minecraft 1.21.6 Pre-Release 1
Edition	Java Edition
Release date	May 28, 2025
Type	Pre-release
Pre-release for	1.21.6
Downloads	Client (.json); Server
Obfuscation maps	Client; Server
Protocol version	dec: 1073742076; hex: 400000FC
Data version	4430
Resource pack format	63
Data pack format	79
Minimum Java version	Java SE 21

1.21.6 Pre-Release 1 (known as 1.21.6-pre1 in the launcher) is the first pre-release for Java Edition 1.21.6, released on May 28, 2025.^[1]

Additions

General

Tags

Added the #quick_actions dialog tag.
- Dialogs to open when pressing quick actions.

Changes

Blocks

Dried ghast

The dried ghast now emits a vibration frequency of 11 from the sculk sensor when its block state changes.
The ambient dried ghast sounds are now adjusted under the Blocks sound option instead of the Ambient/Environment option.

Carpet

Shearing carpets for llamas now emits a vibration frequency of 6, while unequipping it emits a vibration frequency of 4 from the sculk sensor.

Items

Saddle

Shearing saddles now emits a vibration frequency of 6, while unequipping it emits a vibration frequency of 4 from the sculk sensor.

Horse armor

Shearing horse armor now emits a vibration frequency of 6, while unequipping it emits a vibration frequency of 4 from the sculk sensor.

Mobs

Happy ghast

A player riding a happy ghast can no longer completely fly through a happy ghast ridden by another player.

General

Controls

A new keybind called "Quick Actions" has been added to allow users to access a set of content-configured dialogs.
- Default key: G
- This feature is configured by minecraft:quick_actions dialog tag.
  - If this tag is empty, the keybind does nothing.
  - If this tag has a single element, the keybind will open this dialog.
  - If this tag has multiple elements, the keybind will lead to minecraft:quick_actions dialog which (by default) lets user select one of the tag elements.
  - If this dialog is removed, the keybind does nothing.
- This option is intended to be used in custom content and by servers, so this tag is empty by default.

Data pack

The pack format version is now 79.
The minecraft:custom click event has been expanded to carry full a NBT tag.

Dialogs

Dialogs can now configure if they pause the game and if they close after an action is taken.
Every dialog can now have inputs and can submit information.
- The definition of actions has been changed to accommodate that.
- The dedicated input dialog types have been removed, since they are redundant now.
- The order of elements is:
  - Body
  - Inputs
  - Actions

Common Dialog fields
- New fields:
  - pause - if the dialog screen should pause the game in single-player mode, default: true.
  - after_action - an additional operation performed on the dialog after click or submit actions, default: close.
    - close - closes the dialog and returns to the previous non-dialog screen (if any).
    - none - does nothing, i.e. keeps the current dialog screen open.
      - Only available if pause is false to avoid locking the game in single-player mode.
    - wait_for_response - replace the current dialog with a "Waiting for Response" screen.
      - Servers are expected to eventually replace this screen with a new dialog.
      - To avoid accidental locking, a "Back" button will become active after 5 seconds.
        Clicking this button will continue as if the dialog was closed (i.e. the game returns to the previous non-dialog screen, if any).
      - The "Waiting for Response" screen will unpause the game in single-player mode to avoid locking the game.

Dialog Types
- minecraft:multi_action, minecraft:server_links, minecraft:dialog_list
  - Replaced field on_cancel with exit_action, holding an optional action.
    - If exit_action is present, a button for it will appear in footer, otherwise the footer is not present.
    - exit_action is also used for the Escape action.
- Removed minecraft:simple_input_form.
  - Since any dialog can now have inputs, this dialog can be replaced by minecraft:notice.
- Removed minecraft:multi_action_input_form.
  - Since any dialog can now have inputs, this dialog can be replaced by minecraft:multi_action (without any specified exit_action).

Input Control Types
- minecraft:custom click event, all inputs will now return either a string or an NBT tag, depending on context.
- minecraft:text
  - Output values:
    - As template substitution: contents without modification.
    - As tag: a string tag with contents without modification.
- minecraft:boolean
  - Output values:
    - As template substitution: on_true when checked, on_false when unchecked.
    - As tag: 1b when checked, 0b when unchecked.
- minecraft:number_range
  - Output values:
    - As template substitution: text representation of current value.
      - Whole numbers will be sent without decimal point.
    - As tag: a float tag with current value.

Dialog Body Types
- Hover and click events on text components within bodies now work as expected.
  - Click events are handled by the dialog screen like any other action - that means it will also run the after_action.

Actions
- The format of actions has been changed due to the merging of plain and input dialogs.
- After every action the dialog will always evaluate the contents of the after_action field (see above).
- Fields:
  - Kept fields: label, tooltip, width
    - New field: action (replaces on_click and on_submit) - an action to perform when button is clicked, optional object with fields:
    - <type-specific> - see below, depends on type

Action Types
- Static Dialog
  - All existing click_event actions (except for open_file) are included as dialog action types.
  - Uses same format as click_event on text components (but with action replaced with type). For example, when using show_dialog, entry for action button will look like:

{
 "label": "some label",
 "action": {
  "type": "show_dialog",
  "dialog": "some:id"
 }
}

- minecraft:dynamic/run_command
  - This action will build a run_command event using a provided macro template.
  - The macro will be expanded with string values from all inputs.
    - For example, if the macro template is some_command $(some_input), the string value from the input with key of some_input will be used for the template expansion.
    - Inputs not used in macro will be ignored, while macro parameters not matching any inputs will be replaced with an empty string.
  - Fields:
    - template - a string with a macro template to be interpreted as a command.
- minecraft:dynamic/custom
  - This method will build a minecraft:custom event using all input values.
  - All input contents will be sent together inside a compound tag, with tag value of each input put under id from key field of that input.
  - Additional static fields can be added to payload.
  - Fields:
    - additions - fields to be added to payload, optional compound tag.
    - id - namespaced ID.

Item models

Item model definitions now have a boolean field oversized_in_gui which is false by default
- If true, the item model will be allowed to be bigger than its item slot
- If false, the item model will be clipped to the item slot size when being rendered in GUI
- This ability of items being rendered outside their slots should not be considered officially supported, it was temporarily restored as an exception since many servers are relying on it
- At some point in the future it is meant to be replaced with an officially supported way of achieving similar functionality
Introduced new item model minecraft:player_head to handle player profile texture loading and rendering
Removed support for minecraft:profile from minecraft:head
minecraft:player_head special model type
- Renders a player head.
- Uses profile from the minecraft:profile component to load a texture. Renders a default texture until the profile texture is fully loaded.
- No fields.
minecraft:head special model type
- No longer supports profile from minecraft:profile component to load a player texture.
- Renders a default player texture when kind is player and no texture override is supplied.
- Fields remain unchanged.

Resource pack

The version is now 63.
Added oversized_in_gui item model field.
Introduced new player head special model type.Minecraft.

Fixes

26 issues fixed

From released versions before 1.21

MC-94800 – URL shown in open URL dialog is not shortened.
MC-140819 – Lectern model extends past inventory slot.
MC-200092 – /setworldspawn seems to ignore the 'angle' parameter.
MC-272825 – Custom filled maps from 23w31a and earlier do not upgrade properly in later versions.

From 1.21.5

MC-280276 – Some item models can still clip into the block below when hovering on the ground.
MC-297868 – Items in the armor.body and saddle slots are not kept when dying while the game rule keepInventory is set to true.
MC-297893 – prevent_equipment_drop enchantment effect does not work with armor.body and saddle slots.
MC-297894 – /clear command does not clear armor.body and saddle slots.

From the 1.21.6 development versions

MC-296420 – '/datapack create' can create directories with illegal names.
MC-296431 – Clipping item sprites to stay in slot makes it impossible to hide the slot for resource packs.
MC-296458 – Player heads in the inventory don't show the right skin.
MC-297275 – Players can desync from their mounts when jumping on a happy ghast.
MC-297550 – Happy ghasts don’t remain stationary correctly when players dismount them while other players are still controlling them.
MC-297807 – Clicking "Save and Quit to Title" in the dialog warning menu takes you to the server list even if the world is singleplayer or locally-hosted LAN.
MC-297817 – Newly placed paintings sometimes appear at a different position.
MC-297848 – The menu background is not shown for a short amount of time when leaving a world from a dialog.
MC-297897 – Players can fall through happy ghasts.
MC-297899 – FPS drops due to clouds.
MC-297906 – Running a command with a large output whilst on a dedicated server causes a kick and no logged output.
MC-297915 – The name plates of entities with an empty custom name are now rendered incorrectly.
MC-298071 – All naturally spawned zombie villagers are professionless since 25w16a.

From the previous development version

MC-298101 – Sniffers now show the digging animation instead of the walking animation.
MC-298116 – The warning text in the confirm link screen is no longer visible.
MC-298117 – All buttons at the bottom of the Realms screen are clickable when no realm is selected.
MC-298139 – Items bigger than the size of a slot incorrectly bleed over onto other items.
MC-298146 – GUI items disappear at high screen resolutions.

Videos

Videos made by Slicedlime:

References

↑ "Minecraft 1.21.6 Pre-Release 1" – Minecraft.net, May 28, 2025.

Navigation

[1] "Minecraft 1.21.6 Pre-Release 1" – Minecraft.net, May 28, 2025.

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