I just found out that’s due to the font Montserrat.
It’s installed by default (on the base image of Fedora Silverblue) but Inkscape doesn’t display the font correctly:
In Inkscape:
- When I write a new piece of text and apply the Montserrat font to it, the text disappears.
- When I replace the font Montserrat with Cairo (Inkscape → Extensions → Replace font), all text becomes visible again (so the text is present).
The font is displayed correctly in LibreOffice, so I think the problem is Inkscape?
Or librsvg? Or the software that renders the fonts?