Cubemap Fog can be tinted, takes tint from main skybox as well https://files.facepunch.com/sam/1b3111b1/XWpxvX189A.png
sky.shader: g_flBrightnessExposureBias and g_flRenderOnlyExposureBias makes no sense when there's tint, barely any existing skyboxes used it properly
Update SkyBox2D component to apply tint to IBL environment probe
https://files.facepunch.com/sam/1b3111b1/G0298YogbO.png