Your system information

• Steam client version (build number or date): Jun 11, 2021
• Distribution (e.g. Ubuntu): Arch Linux
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

1. Add a non-Steam shortcut
2. Launch the non-Steam shortcut
3. Press Shift+Tab to bring up the Steam Overlay
4. Select Force Quit/Exit Shortcut

Actual:
5. Nothing happens or the overlay disappears and cannot be brought back again (overlay crashed?)

Expected:
5. Game exits

Notes:

• this affects both Desktop mode and Big Picture mode
• some non-Steam shortcuts seem to exit successfully (needs further investigation, but games that can successfully exit appear to be launched through a shell script)
• Steam used to run games as children of 'SteamChildMonit', but this seems to no longer be the case, is this an intentional change?
• A side effect of the above change is that external tools such as https://github.com/gamer-os/steam-buddy can no longer determine which processes to exit to shutdown a game

Steps for reproducing this issue:

1. Add a non-Steam shortcut
2. Launch the non-Steam shortcut
3. Press Shift+Tab to bring up the Steam Overlay
4. Select Force Quit/Exit Shortcut