Hi there,
I have an application that places an icon in the system tray, when running.
But it has no icon in the plasma theme I use, thus, instead of an icon, there´s a small black hole.

Now I tried to add an icon for this application to these places:

$HOME/.local/share/plasma/desktoptheme/Elegance/icons/AusweisApp2.svgz
/usr/share/plasma/desktoptheme/default/icons/AusweisApp2.svgz

In my understanding, the icon from /usr/share/plasma/desktoptheme/default/icons/ should appear in any plasma theme used, right?

Well, that icon still does not show up, not with plasma theme Elegance, nor any other....

So, how do I add the icon to plasma theme so it shows up, when the application runs?

Thanx!

Software used:
KDE Plasma 5.18.5
KDE Framework 5.71.0
Qt 5.12.7
Distro: openSUSE Leap 15.2