It looks good to me on DXVK v1.7, so you may want to recheck.

It could also be an issue with RADV.
Looks so, just retested with dxvk v1.7-40-g5558460 - no changes here.
WinterSnowfall - trace replaying fine for you? (it may be different with game, i suppose).
WinterSnowfall - trace replaying fine for you? (it may be different with game, i suppose).
Yes, your trace also looks good on my GTX 1080. I see no flickering.
It's a precision error that only happens on AMD, both radv and amdvlk, d3d9.invariantPosition = True doesn't help.
Just a quick update that this is still present on mesa git. Looking into making a mesa issue if that can help.
Edit: Upstream mesa issue
Comment from the mesa issue
"This isn't a RADV issue as far as I can tell. It's caused by DXVK's D24 emulation using D32. AMD doesn't support D24, nvidia does. If I force DXVK to always use D32 I can reproduce the issue on nvidia."
This is probably caused by the depth bias.
First it draws this with a depth bias:

This this mesh without one:

The problem persists on Windows 11 AMD Adrenalin 25.6.1
Amd doesn't implemt VK_EXT_depth_bias_control which is needed to fix the issue.
Nothing extracted yet.
There are some textures flickering in definite locations (in general game are playable).
Software information
Saboteur.exe (from GOG)
System information
GPU: ACO POLARIS11 (LLVM 10.0.0)
Driver: AMD RADV (mesa build from git)
Wine version: wine-5.5 (Staging)

DXVK version: v1.6-28-g3f4ffdf
Apitrace file(s)
https://drive.google.com/file/d/1EUDneqhTe60--Sojf_RmH5UR-DQS4bkj/view?usp=sharing
Log files
d3d9.log:
Saboteur_d3d9.log
d3d11.log:
dxgi.log: