Uplay does not start

Compatibility Report

• Name of the game with compatibility issues: Assassins Creed Rogue / Anno 2070
• Steam AppID of the game: 311560 / 48240

System Information

• GPU: RX480
• Driver/LLVM version: Mesa 18.3.2
• Kernel version: 4.19.16-1
• Link to full system information report as [Gist]:https://gist.github.com/Shatrico/f91694f4b4f4883bd3d3755d60a69577
• Proton version: 3.16-6 Beta

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.

cant add the logs because it creates 75mb+ big files which I can't upload here

Symptoms

Uplay is updating to the newest version and then does not open

Reproduction

Assassins Creed Rogue:
Start the Game without any additional launch options.

Anno 2070:
Install the game, apply the workaround (replace the Anno5.exe and autopatcher.exe with the ones from version 92) to bypass the "black box" activation screen.

No source file or test is identified. Start by reproducing the Uplay update failure for Assassins Creed Rogue or Anno 2070 with Proton 3.16-6 Beta, using the listed reproduction steps; completion would require the affected game to start after Uplay updates, with supporting logs or a narrowed cause.