Long pressing STEAM+B does not close non-steam games

[Managor]

Your system information

• Steam client version: 1710786209
• SteamOS version: 3.5.17
• Opted into Steam client beta?: Yes
• Opted into SteamOS beta?: Yes
• Have you checked for updates in Settings > System?: Yes

Please describe your issue in as much detail as possible:

Demonstrative video: https://www.youtube.com/watch?v=ZS0ZGvDmQ3s
You can not use the long press STEAM+B chord to shut down non-steam games on the Deck. What makes this behavior odd is that using the STEAM menu and selecting "Exit game" works just fine.

I previously reported this on the Steam Forums https://steamcommunity.com/app/1675200/discussions/1/5057002258665786228/

Steps for reproducing this issue:

1. Launch a non-steam program
2. Attempt to shut it down by holding STEAM+B

[kisak-valve]

Possible duplicate of #8952.

[Managor]

I am able to reproduce this with native applications so I assume flatpak is not the cause.