Missing fonts dialog is ... missing fonts?

missing font

If the very “Missing fonts” dialog himself doesn’t know what font is missing, how shall I? :smiley:

(And this project has been opened and finished on this very PC only a few months ago, I don’t know how anything would be missing here in the first place…)

Please attach the project itself so we can take a look. Pictures of problems don’t typically allow us to troubleshoot effectively. A reminder: