Changing volume using buttons in Game Mode while watching a video from Store pauses the video

[kajetan000]

Your system information

• Steam client version: 1708479383
• SteamOS version: 3.5.15
• 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:

When changing the volume using volume buttons (on the Steam Deck in Game Mode) while watching a video (on Steam Store) the video pauses. This doesn't seem to be intended behavior.

Steps for reproducing this issue:

1. Open the Steam Store in Game Mode
2. Play a video featured on a game page (trailer, etc.)
3. Change volume using volume buttons