Font Override disappears after change

[arrowtype]

What happens:

1. I upload a font for the main override. It overrides fonts!
2. I select "inherit page styles" (though, I think this should instead be the default ... that could be a separate issue, if we want)
3. I click outside of Type-X, to read the page
4. I click Type-X open again to change something, but ... the main font override has disappeared. I have to completely reset the extension to see two overrides again.

https://user-images.githubusercontent.com/45946693/123519027-e025f100-d676-11eb-8d94-18e3b0cbed41.mp4