Icon of a newly installed app launched via Gnome Software is wrong on Arch Linux
Gnome Software 3.38 on Arch Linux
install an app via Gnome Software (I installed Sound Recorder and Swell Foop)
click on "Launch" button (observe generic/wrong icon in the top bar)
press alt+tab and hold alt key. We can obverse generic/wrong icon again.
close the app and click on "Launch" button again: now the app icon is correct