I also have the same exact issue, and I'm playing on a 3440 x 1440 21:9 ultra-wide. It does go away when resolution scale is set to 100%, however that is not a solution as the game looks like it's slathered in vaseline without upscaling.

System specs:
ASUS ROG Crosshair VIII Dark Hero
AMD RYZEN 9 5900X w/ Lian Li Galahad 360mm AIO (no overclock)
64GB G.SKILL TridentZ Neo 3600 CL16 RAM (no overclock)
EVGA RTX 3090 FTW3 Ultra (most current drivers)(no overclock)
Samsung 980 Pro M.2 PCIe 4.0 500GB (OS)
Samsung 980 Pro M.2 PCIe 4.0 2TB (games)

Monitor: ASUS ROG Strix 34" 3440 x 1440 144Hz 1ms ultra-wide