What command line are you using?
Are you explicitly using the cairo renderer? (-Tsvg:cairo)
While including images does not work with the cairo renderer, it does work with the Graphviz-native SVG renderer. On my computer, -Tsvg invokes the native renderer.
Hello, I was using -Tpng in my command line.
If I use -Tsvg it seems to work.
Why can’t I convert the output to png directly ?
At least by using -Tsvg it fixes my problem, since I can use an external software to rasterize my svg to a png.