Qt Quick && SVG
Is there any support for SVG filters such as feGaussianBlur?
QtQuick Image is able to load SVGs but fails to render correctly if filters are used.
QtSVG module only supports SVG Tiny 1.2 specs. Possibly the blur is not in it. More detailed info is in the documentation.
QtWebEngine does support full SVG, by the way. But of course, it if a big dependency and harder to integrate than normal QtSVG content.