So I have this magical SVG from my school on my github.
When I preview it on Github, it has a white font. When I open it in Inkscape v0.92, it has a white font.
However, when I try to open it in Inkscape v1.2, it has a black font.
I suspect the SVG might be malformed somehow, but I read the file and it seemed normal to me so I cannot figure it out.
So apparently the phenomenon was a bug: