Vibrant Visuals: Sky appears sunny during thunderstorm

During a thunderstorm with vibrant visuals on, it's still sunny, just with rain and reduced render distance.

Steps to reproduce:

1. Create a world with cheats enabled and with the vibrant visuals expirement on

2. Set the graphics to Vibrant Visuals in Video Settings

3. Set weather to rain or thunderstorm

Expected result:

No shadows, and a darker, stormy sky

Actual result:

Sky stays sunny, with only rain and fog