I noticed this immediately in all of my builds, too. I used the five ages glitch to pop out of the ceiling in a home (a large in Lavender Beds) I decorated to check the void, and there's a very bright yellow sun, complete with intense godrays, up there that I don't remember being there before. Housing has always had a skybox with a day/night cycle, but I don't remember it containing a sun.

Maybe this is an oversight of general skybox changes, and where the intense yellow light is coming from?