Hi~! You've made a cool mod, i've enjoyed playing it! But, closer to deal, it's ruining the weather effects in minecraft.
Here is a list of the mods, plus i installed OptiFine and used the "Sildurs Vibrant Shaders v1.29 Lite" shaders . The Bug appeared and with no shaders. Good Luck!

How is it ruining the weather effects? We've had some people talk about weather events like rain never occurring in the world, even with commands. Is this your case?