Since KDE/Plasma updated to 5.25.*, I miss at X11 the background transparency.

If I look in Profil Settings "Erscheinungsbild" there is the red marked text
visible:

"Dieses Farbschema verwendet einen transparenten Hintergrund, der von Ihrem
System scheinbar nicht unterst���tzt wird."

But why the Color Porfile don't support the transparency anymore :-(

I use transparency not only due to nice design reasons. Also to read an article
in the background and code or test the new readed stuff in the konsole.