Possible conflict with Kartrider: Drift/Nexon Game Security and certain Steam Guide shortcuts

Issue transferred from https://github.com/ValveSoftware/Proton/issues/6480.
@nodeunit posted on 2023-01-25T06:17:14:

Compatibility Report

• Name of the game with compatibility issues: Kartrider: Drift
• Steam AppID of the game: 1184140

System Information

• GPU: AMD Van Gogh 0405
• Driver/LLVM version: amdgpu
• Kernel version: 5.13.0-valve36-1-neptune
• Link to full system information report as Gist:
• Proton version: Next 7.0-6

I confirm:

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

Symptoms

Kartrider Drift is almost flawless except for some quirks that break Steam Input.
If you perform a screenshot using the guide shortcut (e.g. Steam + R-shoulder), the game stops responding to any controller input, and the Steam overlay also stops appearing on top of the game. On devices without a keyboard like the Steam Deck, this renders the device softlocked unless a peripheral is plugged in that can force another window to the top (e.g. using a remote device paired with KDE Connect, and then selecting Run command > Create command). Other commands that act similarly to the screenshot shortcut may also trigger this bug, but I could not confirm this.

I suspect this may be triggered by Nexon Game Security, the anticheat used in this game.

Reproduction

1. Launch Kartrider Drift
2. Login to the game
3. Perform a screenshot using the Guide button + the right shoulder button. The game should soon stop responding to any controller using Steam Input, as well as no longer showing Steam overlay.