Have you ever thought about what it would be like if the lower biomes were in the Upper World, so... now you can see this in your game as it would be if the lower biomes were in the Upper World, you can test it in your world with the OverNether Addon.
Select version for changelog:
Changelog
Fixed a bug that switched fog and particles from 2 biomes = Soul Sand Valley and Crimson Forest.
Pls change the links
Bonus, Overworld in the end