Devilspie2 report only one value of WM_CLASS

[Alexandros Prekates]

I start a program with :
$ qutebrowser --qt-arg name qbclang

and inspecting with xprop -spy i see :
WM_CLASS(STRING) = "qbclang", "qutebrowser"

But devilspie2 in debug mode will report:
Application: qutebrowser
Window: C reference - cppreference.com - qutebrowser (a website i've
loaded) 
Class: qutebrowser

And indeed the following rule cant catch it:

if (string.find(get_window_class(),"qbclang") ~= nil)  then
    -- x,y, xsize, ysize
    set_window_workspace(3);
    set_window_geometry(2000,480,600,1000);
end

So is there is a way to use the second value of WM_CLASS ?