New Features

• Added support for 1.21.7
• Added Russian (ru_ru) localization
• Added new item data types: attribute-modifiers and hide-tooltip
• Implemented trim based custom armor support (compatible from 1.20 to latest)
• Added brewing and smithing_trim recipe types
• Added warnings for unset template parameters
• Added client-bound-data support for advancements and recipe books
• Added vanilla item model override support
• play_sound function now supports target selectors

Bug Fixes

• Fixed world generation failing to correctly detect fluids
• Fixed compatibility issues with the latest BetterModel
• Fixed explosion-related processing errors
• Fixed select-type models incorrectly accepting non-matching parameter types
• Fixed block lighting issues in versions 1.20–1.21.1
• Fixed block/item ID mismatch causing key retrieval errors in 1.20–1.21.3
• Fixed button interactions sometimes failing and incorrectly placing blocks
• Fixed pressure plates not updating signals properly after breaking in 1.20–1.21.4
• Fixed creative mode breaking top doors dropping incorrect items
• Fixed client block tags being erroneously updated due to recipe reloading
• Fixed item frame entity data ID mismatch in 1.21.6–1.21.7

Optimizations

• Resource pack validator is now 200% faster
• Optimized resource pack sending system

⚠️ Important Compatibility Changes

In the 0.0.59.9 update, we introduced the smithing_trim recipe type. Because of this, some existing armor sets (like the default topaz set) now need the minecraft:trimmable_armor tag—otherwise, they won’t work with the smithing table for applying armor trims after this update.

templates:
  default:armor/topaz:
    material: chainmail_${part}
    custom-model-data: 1000
    data:
      item-name: <!i><#FF8C00><i18n:item.topaz_${part}>
      tooltip-style: minecraft:topaz
    settings:
      tags:
        - default:topaz_tools
+       - minecraft:trimmable_armor
      equipment:
        asset-id: default:topaz
        $$>=1.21.2:
          slot: ${slot}
    model:
      template: default:model/armor_trim

We've added checks for missing template parameters in this update, so you might see some console warnings now. No worries though – just set default values for your templates or provide the missing parameters, and the warnings will go away.

    appearances:
      type=top,waterlogged=false:
        state: ${base_block}[type=top,waterlogged=false]
        model:
          path: ${model_top_path}
-         generation: ${model_top_generation}
+         generation: ${model_top_generation:-null}