Comment # 1 on bug 1209838 from Fabian Vogt

(In reply to ross from comment #0)
> There is no KDE wallpaper package installed on OpenSuse tw by default. So
> when user switch to the breeze theme, their screen goes black. I really
> suggest OpenSUSE should install kde wallpaper package by default

It's not required but recommended. If you disable installation of recommended
packages that's what you get.