Might & Magic Heroes VII (321960)

Compatibility Report

• Name of the game with compatibility issues: Might & Magic Heroes VII
• Steam AppID of the game: 321960

System Information

• GPU: GeForce GTX 1070
• Driver/LLVM version: nvidia 430.40
• Kernel version: 5.2.8-1-MANJARO
• Link to full system information:
  https://gist.github.com/kartoffelsup/1d76ccef5f95dfd5ad9b27cf79aa01f8
• Proton version: 4.11-2

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Symptoms

Trying to launch the Game from Steam after a fresh installation results in:

Unable to locate Uplay PC.
Please reinstall Uplay PC

steam-321960.log_1.zip

Executing Uplay via wine directly once and logging in:
env WINEPREFIX=/mnt/Games/Steam/steamapps/compatdata/321960/pfx wine64 /mnt/Games/Steam/steamapps/compatdata/321960/pfx/drive_c/Program\ Files\ \(x86\)/Ubisoft/Ubisoft\ Game\ Launcher/Uplay.exe
then closing it (Uplay) again and launching the Game from Steam seems to solve this issue.

However, this leads me to the second issue. After getting the Uplay error fixed, and running the Game from Steam, it successfully launches
Uplay and then shows the game's loading splash. But after the loading splash disappears, nothing else happens.

The game is shown as 'Running' in Steam and the process is also running, but the game windows never appears unfortunately.

steam-321960.log_2.zip

Running the game directly via wine to leads to the game actually launching:
env WINEPREFIX=/mnt/Games/Steam/steamapps/compatdata/321960/pfx wine64 /mnt/Games/Steam/steamapps/common/Might\ \&\ Magic\ Heroes\ VII/Binaries/Win64/MMH7Game-Win64-Shipping.exe
But unfortunately the performance is very bad (lag spikes, low fps).

Reproduction

Launching the Game from Steam does not work.

Start with steam-321960.log_1.zip and steam-321960.log_2.zip, then reproduce the Steam launch using Proton 4.11-2 and the listed system information. Compare this with the provided direct Uplay and MMH7Game-Win64-Shipping.exe commands; done means the game launches from Steam without the Uplay error or remaining running without a visible window.