There is a bug in the original rendering routine that is likely to be drawing online player names before the skybox, causing player names to have ugly outlines that makes it less readable. Those probably should be rendered after the sky is drawn on the screen.
The original "solution" to the problem was disabling the sky for online modes.
Hence mod had the option to toggle that on and off, but it doesn't fix the underlying problem.
There is a bug in the original rendering routine that is likely to be drawing online player names before the skybox, causing player names to have ugly outlines that makes it less readable. Those probably should be rendered after the sky is drawn on the screen.
The original "solution" to the problem was disabling the sky for online modes. Hence mod had the option to toggle that on and off, but it doesn't fix the underlying problem.