> I imported an SVG image and it came in as a vector image.
How do you know? When I "insert" an SVG image with diagonal lines and zoom to 3000%, those lines are jagged. When I "open" the same image, the same lines are perfectly smooth, and I can also tear the image apart, which isn't possible when "insert"ing it. To me these are strong hints that LibreOffice essentially treats the SVG like a raster image.