Why Does a Fresh Fedora Workstation 44 (GNOME 50) Install Show __custom as the Default Alert Sound?

On a fresh installation of Fedora Workstation 44 with GNOME 50, I noticed that in Settings > Sound > Alert Sound, the selected alert sound is __custom instead of None or one of the standard system sounds.

I have not changed any sound settings since installing the system, so I’m wondering why __custom is selected by default. Is this expected behavior in GNOME 50 or Fedora? What does __custom represent? Could it indicate a missing sound theme or a configuration issue?

Fedora 42 and GNOME 50? You are mistaken, Fedora 42 used 48

I meant 44 mb [Fedora Linux 44 (Workstation Edition)]