What's up with designspace files that point to UFOs whose feature files dn't match?

According to https://github.com/rsheeter/google_fonts_sources/blob/main/ufo_fea_consistency.py sometimes a designspace references many feature files that match ... and sometimes not. I'm not quite sure what to make of the case where they don't match. Maybe I just oversimplified and failed to skip some I should have skipped?

https://gist.github.com/rsheeter/31f5233580a4328c8c3ac46d27646b2b shows results as of 1/6/2023