I'm using Manjaro XFCE with the default icon theme (Vertex-Maia). Unfortunately there seem to be missing icons in Inkscape:

As you can see, the icons for "snapping" are missing and there seems to be a general problem with mixing Inkscape icons and the default GTK theme icons.
When I download the icons.svg file from Inkscape trunk and put it into ~/.config/inkscape/icons/, the result still looks the same.
When I make all icons red for easier identification, it looks like this:

Although all icons are referenced in icons.svg, they are only partially replaced in the UI.
I thought all icons in icons.svg are replaced in the UI, but the "global GTK icons" are untouched, even though they have a counterpart in the custom icons file.
Is this a bug?
Currently it is really hard to distinquish some of the icons, e.g. the "edit page properties" and "edit inkscape preferences" button are the same.