This SVG has not extensions, just a standard SVG.
Now, I do not understand why the fonts are not properly displayed in Inkscape, I do not know if it is from me or from Inkscape itself, the fonts have a default font family that is

I have this restriction that fonts cannot be embedded using base64.
I have tried everything I could imagine but no solution ...
In the attached file, you can see the manifestation(btw, thx for the 0.92+, it fixed the external reference for images using non-absolute path).
Is there anything I can do ? Is it a bug/intent ? Thank you!