Personal ratings ignored; can’t change background fanart images for genre buttons

This closed thread discussed how to manually change the films chosen to represent each of the movie and television genre buttons.

I’m finding this no no longer works. Downrating Infuses’s preferred film does not work; nor does up-rating my preferred films.

Is it possible local XML/NFO ratings (sourced from TMDB) take precedence over star ratings chosen manually in the app?

Please advise.