[Wayland] PWAs no longer appear as separate app windows — all group under main Edge icon

Hi,

Since around 2025-09-07 to 2025-09-10, I’ve noticed that on GNOME (Wayland) all installed PWAs (even across different profiles) now appear grouped under the main Edge browser icon in the GNOME Shell dash/taskbar.

Previously, each PWA would open in its own window group with its own icon. This is still the behavior in Chromium/Brave/Chrome, and can be restored there by editing the PWA’s .desktop file to set:

StartupWMClass=<same value as Icon>

However, Edge now seems to ignore StartupWMClass completely on Wayland, breaking workspace separation and making task switching hard.

Environment:

• Ubuntu 25.04
• GNOME 48.0 / Mutter (Wayland)
• Kernel 6.14.0-29
• Intel Iris Xe GPU
• Edge (latest stable, observed post 2025-09-13)

Repro steps:

1. Install any PWA (e.g. Outlook, Teams, Spotify) from Edge
2. Launch it (from any profile)
3. Observe that it appears grouped under the main Edge browser icon

Expected:
PWA shows under its own icon and window group like in Chromium-based browsers

Actual:
All PWAs are bundled into the main Edge window group
Editing StartupWMClass in the .desktop file no longer helps

This regression makes PWAs much harder to manage on Wayland. Please route to the Linux/Wayland team if possible. Thanks!