[Bug] December 2025 Release fails to load on MC 1.21.7 due to malformed pack.mcmeta

[ImpureCrumpet]

Minecraft Version: 1.21.7
Pack Version: [1.21.8] Faithful 32x – December 2025 Release
Previous Working Version: Faithful 32x - 1.21.7 (July 2025 Pre-release)

Description

The latest release of Faithful 32x (December 2025) fails to load in Minecraft 1.21.7. This version appears as the recommended download for 1.21.7, but when selected, the game throws a DataResult.Error regarding missing metadata keys.

The previous version (July 2025 Pre-release) loads correctly.

Error Log

[Render thread/ERROR]: Couldn't load pack metadata: DataResult.Error['No key pack_format in MapLike[{"description":"The go-to 32x resource pack.\n§8December 2025 Release","min_format":56,"max_format":64}]']

Technical Analysis

The pack.mcmeta file in the 1.21.8 release is malformed. It is missing the mandatory pack_format key and uses incorrect syntax for version ranges (min_format instead of supported_formats).

Comparison of pack.mcmeta files:

Key	Working (1.21.7 / July Release)	Broken (1.21.8 / Dec Release)
pack_format	64	MISSING
Range Syntax	supported_formats { ... }	min_format / max_format

Code Diff:

1. Working Code (July Release):

{
  "pack": {
    "pack_format": 64,
    "description": "The go-to 32x resource pack.\n§July 2025 Pre-release",
    "supported_formats": {
      "min_inclusive": 43,
      "max_inclusive": 64
    }
  }
}

2. Broken Code (December Release):

{
  "pack": {
    "description": "The go-to 32x resource pack.\n§8December 2025 Release",
    "min_format": 56,
    "max_format": 64
  }
}

Steps to Reproduce

1. Launch Minecraft 1.21.7.
2. Download the Faithful 32x – December 2025 Release.
3. Attempt to select the resource pack in the menu.
4. Observe that the pack fails to apply and the error appears in the log.

Suggested Fix

Update the pack.mcmeta to include the fallback ID and use the correct structure for ranges:

{
  "pack": {
    "pack_format": 64,
    "description": "The go-to 32x resource pack.\n§8December 2025 Release",
    "supported_formats": {
      "min_inclusive": 56,
      "max_inclusive": 64
    }
  }
}

[ImpureCrumpet]

Confirmed that suggested fix works.