1.21.6 Pre-Release 1 — release journal
What 1.21.6-pre1 changed for data packs, measured against 25w21a, the build before it. Released 2025-05-28; development build — not a release.
⚠ Breaking for data packs
This build removed 1 registry. Any file that referenced them stops loading.
Formats
| 25w21a | 1.21.6-pre1 | |
|---|---|---|
| Data pack format | 78.0 | 79.0 moved |
| Resource pack format | 62.0 | 63.0 moved |
| Data version | 4429 | 4430 |
Registries
11 entries added and 5 removed across 5 registries.
| Registry | Change | Added | Removed |
|---|---|---|---|
submit_method_type | registry removed | — | command_template, custom_form, custom_template |
dialog_action_type | new registry | change_page, copy_to_clipboard, custom, dynamic/custom, dynamic/run_command, open_url, run_command, show_dialog, suggest_command | — |
dialog | changed | quick_actions | — |
dialog_type | changed | — | multi_action_input_form, simple_input_form |
tag/dialog | changed | quick_actions | — |
The official notes
Read the 1.21.6 Pre-Release 1 article on minecraft.net.
That article's technical changes are grouped under these headings — open it for the detail:
- Data Pack Version 79
- Quick Actions Keybind
- Common Dialog fields
- Dialog Types
- Input Control Types
- Actions
- Resource Pack version 63
- Item Models
Minecraft Wiki page for 1.21.6-pre1.
In the journal
← 25w21a · All builds · 1.21.6-pre2 →
Sources
- misode/mcmeta — 1.21.6-pre1 summary — formats and registries, generated from the game’s own data.
- minecraft.net — 1.21.6 Pre-Release 1 — section names only.