Font size 6.5 displays right in the program but is rounded up on PDF export, leading to export not matching what was promised
I’m not attaching the score because you’d need to have the fonts installed, but AIUI this would happen with any fonts.
See the example score’s header rendered in MuseScore and how it appears in PDF (I rescaled the PDF to roughly the same width as in MuseScore so they are comparable).
I specifically set its header to
<font face="Inconsolatazi4varl_qu"/><font size="6.5"/>$:pathweb: (size 6.5) so the text fit and did not have the overlap. What ended up in the PDF was the font at size 7. (Changing it to 6 fixed it but made the text even smaller and thus harder to read.)