After loading a quicksave near Dres, the stars disappeared and Dres appeared to be transitioning between two detail levels, but one of the models was missing. Turning the camera caused the sky to change colour, seemingly applying one pixel of the normal skybox to the entire sky.
The sky returned to normal after loading the previous autosave, but subsequent quicksaves whilst still near Dres caused the issue to occur again. After leaving Dres's sphere of influence and loading a quicksave, the bug stopped entirely, and I was unable to trigger it again, even when loading the same saves that it had occurred for previously.
Log file: https://www.mediafire.com/file/94viuxahfph256c/Player.log/file
Specs:
Windows 10 22H2
AMD Ryzen 5 3600 6-Core Processor
16GB RAM
Radeon RX 570 Series
Images: