> (…) Inkscape does not make use of embedded fonts in PDF files (…)
The preview image shown in the import dialog is rendered via cairo-poppler (which likely outlines the embedded fonts). The actual import (conversion) of the PDF file uses different internal import routines (during which embedded fonts are replaced with closest-matching fonts found among the installed fonts of the local system).
Nevermind my earlier comment:
> (…) Inkscape does not make use of embedded fonts in PDF files (…)
The preview image shown in the import dialog is rendered via cairo-poppler (which likely outlines the embedded fonts). The actual import (conversion) of the PDF file uses different internal import routines (during which embedded fonts are replaced with closest-matching fonts found among the installed fonts of the local system).