Nether fog abruptly changes color when moving across biomes

The bug

When moving across certain biomes, the background fog color suddenly changes from red to blue (or vice versa). This happens regardless of the "Biome Blend" setting in video settings.

To reproduce

• Create a world with seed 5643308435228203964
• Run /execute in minecraft:the_nether run tp -170 90 -40
• Move towards the soul sand and back into the crimson forest; the fog should suddenly change colors.