Same issues here as well. Changing graphics settings, and verifying game integrity through steam does not fix issue. One thing I noticed is each icon of the same item gets corrupted the same way. For example if there is a red polygon on a Battanian Pony's icon in my party, it will have the same red polygon in the exact same spot in a city's trade menu. The corruption is random for each icon, but once set, each icon of the same type is corrupted the same way. Hope this helps! I've attached some screen shots showing the corruption.
My specs:
OS: Windows 10
GPU: AMD Radeon 5700 XT Sapphire Pulse
GPU Driver Version: 21.2.3 (released 2021-02-17
CPU: AMD Ryzen 7 3700X
RAM: 16gb DDR4
Motherboard: Gigabyte Aorus X470 Gaming 7 Wifi
Storage Device (HDD/SSD): Samsung SSD 850 Evo 500GB