Your system information

• Steam client version (build number or date): 1709846872
• Distribution (e.g. Ubuntu): ArchLinux
• Opted into Steam client beta?: No
• Have you checked for system updates?: [Yes/No]
• Steam Logs: steam-logs.tar.gz
• GPU: AMD

Please describe your issue in as much detail as possible:

Builtin music player doesn't use chosen audio device, if the device is connected after the client boots (e. g. bluetooth headphones). QJackCtl and the audio widget in KDE Plasma show that the client plays sounds to another device, but I could change the device only with QJackCtl.
Interestingly, the main client does choose the audio device properly, as interface sounds do work in Big Picture mode. The problem affects only the music player.

Steps for reproducing this issue:

1. Launch Steam
2. Connect an audio device (e. g. a bluetooth headphones, only after)
3. Start music