Bug 2457844

After updating to xdg-desktop-portal-1.20.4-1.fc43, the "Apps" section in GNOME Settings (gnome-control-center) appears blank. Additionally, screen recording applications (such as GPU Screen Recorder) fail to capture audio because the portal cannot establish a session.

Running /usr/libexec/xdg-desktop-portal-gnome -v manually reveals that the service starts, monitors fonts, and registers interfaces, but immediately terminates with the error: XDP: name lost.

Reproducible: Always

Steps to Reproduce:
1.Update system to the latest Fedora 43 packages (including xdg-desktop-portal 1.20.4).
2.Open GNOME Settings -> Apps.
3.Observe the blank list (only "Default Apps" might show up).
4.Attempt to record screen with audio using GPU Screen Recorder.
Actual Results:
The "Apps" category in GNOME Settings is blank and fails to list any installed applications. Additionally, ScreenCast sessions (e.g., in GPU Screen Recorder) fail to acquire audio streams through Pipewire. Manual execution of the backend via /usr/libexec/xdg-desktop-portal-gnome -v results in an immediate "XDP: name lost" error, suggesting a failure to maintain the D-Bus session name despite the service appearing as "started" in systemd.

Expected Results:
The "Apps" section in GNOME Settings should populate correctly with the list of installed applications and their permissions. The portal backend should successfully acquire and hold its D-Bus name (org.freedesktop.impl.portal.desktop.gnome), providing functional ScreenCast and Settings interfaces for client applications.