Dorico 2.2.20 on Windows 10 creates PDFs where the font descriptors use the path and file name of the font, e.g. C:\WINDOWS\FONTS\BRAVURA.OTF. Dorico declares the file to be PDF 1.4, but table 5.18 in the PDF 1.4 specification says that FontName in the font descriptor should be the PostScript name of the font, i.e. Bravura. The same problem is replicated for all fonts in the file.
One easy way to display these font names in a PDF is to use the Properties panel, Fonts tab of Acrobat - I think the functionality is there is Acrobat Reader also.
This problem messes up import of Dorico generated PDFs into Adobe Illustrator, also it might impact on rendering optimisation by PostScript printers.