That’s really strange SVG mime type is missing! Anyway, we’re going to provide workaround in the upcoming Verge3D update.
BTW could you confirm this works for you?
if mimetypes.guess_type('abc.svg')[0] == None:
mimetypes.add_type('image/svg+xml', '.svg')
We’ve confirmed with them that this works for him. However, we haven’t yet identified the cause, not able to reproduce it on our side. So far, we’ve received two identical reports of this issue.
As feedbacks, the browser console shows a 200 status for the SVG file, confirming it’s being found and served correctly (no 404 errors). If directly accessing the icon URL triggers an SVG file download.