SVG icons and font icon displayed simultaneously

Hi,
I'm using GP Premium with a child theme and just turned on SVG icons in Customizer. Now I have down and left pointing arrows in the menu, but ALSO a little block with the Unicode numbers of these symbols in the GP font. Obviously, the font is no longer send, but the CSS still says

dropdown-menu-toggle::before {
    content: "\f107";
    font-family: GeneratePress;
    display: inline-block;
    width: 0.8em;
    text-align: left;
}

I think that "display: none;" would be better or maybe remove the whole selector+rule from the CSS?

And this code does not come from my child theme's CSS nor is it part of the CSS tweaks in Customizer.
I cleared the cache - no change. I turned off WP Rocket - no change.
GP Premium is 1.9.1, GP is 2.4.1
WP is 5.3