In Minecraft, the newly introduced client biome files allow resource pack authors to modify biome-specific visual and audio properties. However, these files do not inherit default values from the vanilla game. This means that if a resource pack author wants to modify just one property (e.g., fog appearance), they are forced to include all other biome properties (such as water and grass color) in their file.
This lack of inheritance creates issues. Any update to Minecraft’s default biome properties can break resource packs unless authors manually update their files to reflect the latest vanilla changes. This makes resource packs unnecessarily prone to breakage, as authors must always account for every single property instead of only defining what they intend to modify. Ideally, client biome files should inherit vanilla defaults unless explicitly overridden, this behavior also matches many other areas, such as entity.jsons.
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However, this issue has been temporarily closed as Awaiting Response.
Could you please attach an addon showcasing the issue?
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Added a resource pack to help demonstrate this issue.
The pack contains a client biome for pale garden, where only fog component present which is referencing a pale garden fog with bright yellow colors.
The pack clearly demonstrates that at least some the missing client biome data is NOT being inherited from vanilla defaults. Because as soon as you find a pale garden biome in-game you will notice grass colors are a green instead of grey (as defined by vanilla client biome, which is also included in the pack for reference).
This issue still affects the latest Preview (1.21.90.26) as of now.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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Can confirm. This issue is a major reason why MCPE-189816 happened, and it will happen again with dry foliage colormaps if Mojang doesn’t fix this issue.