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Victor Gaultney:
Yes, we and one other user have seen this problem. Word is not properly linking the font family together. It seems to be a bug introduced in macOS Word 16.52 and still not fixed in 16.53. We saw no problems with Word 16.51 and our version 6+ fonts.
This isn't unique to our fonts. Some of the fonts that ship with macOS have the same problem (Charter, Baskerville, Palatino). Those are just a few examples of wider problem. Some other fonts like Cambria work fine.
Please complain to Microsoft! The more they hear from users the more attention they will give to it. A post on a Microsoft Forum remains unanswered:
https://techcommunity.microsoft.com/t5/office-for-mac/bold-italics-not-working-on-word/m-p/2625182
We have found no way to fix the problem or to make changes to the fonts to work around the bug.
There are two standard things to try when font family relationships turn sour in MS macOS apps:
Clear your font caches. Here's a good article on that, although since the fonts are working fine in other apps it's highly unlikely that it will help: https://glyphsapp.com/learn/eliminating-font-cache-problems
Completely uninstall and reinstall all Microsoft Office apps. Yeah that's a bit extreme, but that seems to be Microsoft's standard response.
I hope one of those might help you. I'll keep trying to find a solution. If you discover one please let us know. As a Mac user myself this is very frustrating!