There seems to be a bug related to the Nvidia drivers running Assassin’s Creed Odyssey under Wine/DXVK that causes a temporary corruption of some surfaces in the game when LOD levels change.
The issue seems to manifest on 418.xx+ drivers except for the 418.31.03 Vulkan beta driver. The bug goes away on that release, but returns on every release after that. The DXVK developer seems to think that this is an Nvidia specific bug, and not with DXVK.
The additions and fixes from the 418.31.03 Vulkan development branch have not been merged into the main driver branch yet. So just wait for an upcoming driver release and stay on the beta branch meanwhile.
418.52.05 should contain all changes from 418.31.03, at least if the Nvidia devs don’t have a completely odd development track. So this really seems to be a newly added bug.