The sky randomly loses turns black.

[gaunt oxide]

I've been experiencing some issues where the sky will randomly turn black even though it's daylight out, the sun still casts shadows and what not.
Edit: I'm using the latest version of RTX Reactor on John Smith Legacy and Better RTX.

[tropic dove]

Try joining the world with RTX already enabled if you dont, RTX likes to break if you don't. And your screenshot screams several issues of that

[gaunt oxide]

I do join with RTX already enabled. It's not a constant black sky, as the sun moves across the sky it will snap back to normal but it's very odd and distracting.

[tropic dove]

It might be something breaking with both BetterRTXs sun path and Vanilla RTX sun path

I'm not super positive tho, you could try uninstalling better RTX and testing it

[pliant veldt]

Yes that's indeed the issue, they don't go well together.
Only options are to either use unmodified default game, delete lighting folder in subpacks/experimental/lighting, or switch to default option in Vanilla RTX.