When you install a PWA1 in the Chromium snap you might expect it to open it in a separate, streamlined window when you open it using its shortcut in the applications grid.
Presently, PWAs in the Chromim Snap don’t get detected as separate instances by GNOME Shell. This means no separate dock icon (it is grouped into Chromium’s) and it is not treated as a separate app by the task switcher, making it difficult to alt/super + tab to it.
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Oracular carries an Ubuntu-specific chromium-snap-pwa.patch to GNOME Shell.
This patch ensures that PWA windows from the Chromium snap are handled per users expectations: their own dock icon, and their own entry in app switcher.
The plan is to back-port this patch to Ubuntu 24.04 LTS too, so keep an eye out for that.