In most biomes, grass color is correctly derived from assets/minecraft/textures/colormap/grass.png using the biome's temperature and downfall values.
However, the following biomes use a hardcoded grass_color value that completely bypasses the colormap :
All Badlands(intended as per MC-30445)All Swamps(intended as per MC-30445)Pale Garden
Cherry Grove(intended as per MC-260264)Sulfur Caves
Dappled Forest
This means resource packs cannot consistently customize grass colors across all biomes, because grass.png only applies to some of them.
Expected behavior : colormap/grass.png affects grass color in all biomes, or an equivalent resource pack mechanism exists for biomes using grass_color.
Actual behavior : colormap/grass.png is silently ignored for the listed biomes.
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Here is a resource pack replacing colormap/grass.png with a fully red gradient. As shown in the screenshots, the colormap correctly affects grass in standard biomes, but has no effect in Swamp, Cherry Grove, Pale Garden, Badlands, Sulfur Caves, and Dappled Forest. This confirms that grass.png is silently bypassed in these biomes.
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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Minor triage error – this bug is still not resolved in the latest snapshot 26.3 snapshot 4.
Grass colors remain unchangeable via colormap/grass.png in the following biomes:
Badlands
Swamps
Pale Garden
Cherry Grove
Sulfur Caves
Dappled Forest
Additionally, the related bugs MC-30445 and MC-260264, despite being marked as resolved, still persist. The grass-block coloring mechanism via colormaps is still not standardized, preventing consistent texture customization by resource packs.
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Could you please provide a resource pack showcasing the issue?
This ticket will automatically reopen when you reply.
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