Created attachment 174188 [details]
Output from journalctl

SUMMARY
After updating from Qt 6.7.2 to 6.7.3 the "Sound" menu in system settings stays blank after opening it.

It only shows the devices and playback streams after interacting with other sound controls (e.g. "Show inactive devices" or the widget in the panel) or when switching to a different menu and switching back to "Sound".

Actual audio playback is not impacted and works fine.

This did not happen with Qt 6.7.2.

STEPS TO REPRODUCE
1. Update to Qt 6.7.3
2. Open "System Settings"
3. Open "Sound"

OBSERVED RESULT
No audio devices or playback streams are shown.

EXPECTED RESULT
Audio devices and playback streams are shown.

ADDITIONAL INFORMATION
If you interact with the sound widget in the panel (e.g. switching output) while the blank "Sound" menu is open, the devices and playback streams appear in the "Sound" menu right away and can be interacted with.

This also happens if you toggle the "Show inactive devices" control if it is present.

Alternatively you can also open "Sound" and if it stays blank switch to another menu (e.g. "Accessibillity") and then switch back to "Sound". Then the devices and playback streams also show up and can be interacted with.

This happens on 2 PCs with completely different hardware / sound hardware (1x all AMD desktop and 1x all Intel laptop). But the software on both is the same (Linux distro, Plasma version, Qt version, ...) and it was no issue before updating to Qt 6.7.3 on both.

SOFTWARE/OS VERSIONS
Operating System: EndeavourOS (Arch Linux)
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.3
Kernel Version: 6.10.10-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7800X3D 8-Core Processor
Memory: 30,9 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX