Same problem,
https://i.imgur.com/Ml6uMsO.jpg
https://i.imgur.com/XSke3Un.png
https://i.imgur.com/0X8EHio.jpg
https://i.imgur.com/4rXwRZn.jpg
Both dx11 and dx9 has the problem. No addon. Sometimes the ground also disappear, and i can't move at all. Once it bugged, subsequent load can't fix anything. The bug is there until complete client restart. Some character's picture in character selection are also completely black.