LEGO City Undercover uses single controller input for both players

[TitanNano]

Compatibility Report

• Name of the game with compatibility issues: LEGO City Undercover
• Steam AppID of the game: 578330

System Information

• GPU: RTX 5060
• Video driver version: NVIDIA 580.119.02
• Kernel version: 6.17.12
• Link to full system information report as Gist: https://gist.github.com/TitanNano/2f5506b1dc6aaf7b964d78b7c565ab98
• Proton version: 10.0-3

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.

steam-578330_lego_city.log

Symptoms

When launched through Steam Big Picture Mode, the game recognized the single connected Steam controller as input for both players.

• This issue did not exist before Proton 10. (i.e., Proton 9 works fine)
• This issue does not occur when launching the game through the regular desktop mode of Steam.

Reproduction

1. start big picture mode
2. Start LEGO City Undercover
3. Load a save game or start a new one.
4. In the game world, press any of the controller buttons. (Moving the analog stick does not trigger the issue.)
5. The second player gets enabled.
6. Both players are controlled by the same controller.

[kisak-valve]

Hello @TitanNano, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to #1961 (comment).