Sharp and persistent drop in graphical quality upon entering the Vallis

[HighwindAlpha]

I'm honestly not sure whether this belongs here or in the Performance Bugs sub-forum.

 

When I enter the Vallis, be it coming from Fortuna or directly from the star chart, the graphical quality of the game suddenly drops, turning what were once crisp and detailed models into blurry or jagged messes that no amount of fiddling with the graphics settings could fix. The most concerning part, however, is the fact this drop in graphical quality carried over to the rest of the game once I left the map. The loading screens look as good as ever, but my ayatans look blurry, the reflections are all wrong and all models seem to have lost a couple hundred polygons.