Italic type does converts to hot mess (from .docx to .pdf)
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philthelion
If used in Microsoft Word 365 (up to date version), an italicized text will not properly convert to .pdf format (using Acrobat PDFMaker addod – with native Word "save as .pdf" the problem will not occur). Instead, from resulting .pdf inspection, it seems all italic type text is typed out in Linux Libertine Initials (see the attachment).
I don't have access to Acrobat PDFMaker, but if this is still a problem for you I would invite you to try the same thing using fonts from the Libertinus fonts fork. If it is still an issue there I'll be glad to look into it and fix it if it is an issue with the font.