So, as the title says, an overlay is z-fighting with a brush making it flicker in Hammer and in game. I don't mind it flickering in Hammer that much (my 3D view is set to 3D textured) but I need it to not flicker in game. It only flickers when I am ~2200 units or more away from it.
(Map has proper lighting, no leaks, and pressing Alt + P shows no errors)
(Map has proper lighting, no leaks, and pressing Alt + P shows no errors)