I have the same behavior:

DXVK 1.5.1 (using Proton 4.11-12), Mesa 19.3.2 and AMD RX 580 4GB.
Seems more a problem with shadows, but there are some minor graphic glitches here and there, mostly in the upper part of the rendered screen.
The game works perfectly, nonetheless.
Fixed!
Thanks for the quick fix :1st_place_medal:
No worries! Have fun :)
proton 4.11-12x2 2020-01
The game runs fine for the most part, just some weird issues with water "reflections" that I'm not seeing anyone else post on ProtonDB or elsewhere. Even more strange, the "reflections" don't seem to be rendered in Windows at all (i.e. the protagonist isn't mirrored in the surface, or anything like that).
Software information
Game: King's Bounty: The Legend
Settings: All on max; changing them seems to make no difference to the issue
System information
Apitrace file(s)
https://www.mediafire.com/file/okuycpq46l4xosd/kb_trace.tar.gz/file
Log files
KB_d3d9.log
Screenshots
D9VK:

Windows:
