When we save a Word doc as interactive PDF the title font, which is Lydian, is replaced. This has been verified on various Mac computers running Mojave and Catalina. It is not happening when creating a print PDF nor when making the PDF with Acrobat from CS6 on older Macs.
I have created a short video that shows the process and outcome. Find attached samples of Word.doc, the created PDF, a screenshot showing them side by side, the Lydian font and an older PDF that has the Lydian showing properly.