Very often in my game, Guts & Blackpowder, while a map loads or by just joining mid-match, the atmosphere for that map will fail to load, causing very noticeable and ugly lighting. I have no clue why this happens, and the only way to fix it seems to be to re-insert the atmosphere instance into Lighting, which I do all over my code to ensure the atmosphere loads. It seems more prevalent on low-end devices, but even happens on my PC with 48GB of RAM, Ryzen 5 3600 6-Core, RTX 2060.
Here’s what it looks like on the Roscoff map:
And this is what it’s supposed to look like when the atmosphere loads correctly: