Savanna looks like Woods/Jungle on a map

This is not a bug per se, but is quite annoying in my opinion. I marked areas that are savanna in the game world (also my character is inside this biome during the screenshot), but on the map it always looks like a woods or jungle biome. Couldn't that be easily fixed by just replacing current textures with textures of pale plains green that is used in savannas anyways?

Thank you team!