Variable Font shows on macOS and Linux but doesn't show on Windows

A certain variable font https://github.com/iaolo/iA-Fonts shows on Linux and macOS, and while loads successfully on Windows, it fails to show on Windows.

I attached all the files necessary to reproduce this. The font will show on macOS and Linux but won't show on Windows.

Other fonts seem to show just fine, only this particular font doesn't load. The font files are variable fonts files (which should be supported in Qt 6.7.0. Using the static font variant doesn't seem to work as well, which is weird, since on my previous note-taking app it works. Maybe it's a regression?

Edit: the static font variant seems to work.