This issue is still happening in 9.0 even with the shattered sky skybox in Icecrown. See screenshot: https://imgur.com/a/BRu0sj8
This has been happening since patch 8.1 at least. I’ve done a fresh install of the game since then and nothing has “fixed” it so I doubt it’s on my side. I run the game on max graphics settings. It’s quite immersion-breaking.