Font size too small
This StackOverflow thread says 12px is the minimum: https://stackoverflow.com/questions/57095841/google-says-text-too-small-to-read-but-no-info-about-recommended-font-size
But the attached screenshot shows that the badge text shows up at 11px. I haven't checked the text sizes within the generated documents, but that sounds like it would be worth investigating too.
None of the other fonts on this site are under 12px, and I'm unable to customize the iFrame style on my end, so I'm hoping your team can include this fix in an update.
Thanks for building a great product in general :)