Fonts in Character Styles list erroneously labeled as "missing"

OS:

Mac Big Sur 11.2.3

System:

MacBook Pro (Retina, 15-inch, Mid 2014)

Processor 2.8 GHz Quad-Core Intel Core i7

Memory 16 GB 1600 MHz DDR3

Graphics NVIDIA GeForce GT 750M 2 GB

XD version:

38.0.12

Font management:

Suitcase Fusion v.21.2.2

Issue:

I'm experiencing an issue in which fonts in the Character Styles list are erroneously being labeled as missing, when I clearly have them loaded and permanently turned on in Suitcase Fusion — and they're listed in the available fonts menu within XD, and they're displaying correctly on my artboard.

In this example, the font is Biennale.

This shows the font loaded and active within Suitcase Fusion:

This shows the text on my artboard, set in Biennale. The font list to the right clearly shows Biennale as the selected font:

This shows that Biennale is one of several active fonts available to use within XD:

However, when I make that type a Character Style, it displays with an eclamation point icon, and the font is labeled as "missing." In fact, other fonts I've added to my Character Styles list are also being erroneously flagged as missing:

If I hover over the H1 Character Style, for example, I get this full error description:

So as you can see, this doesn't make any sense, since I clearly have Biennale loaded and turned on in Suitcase Fusion, and I'm actively using it in my XD file.

So what gives?

Additionally, my XD file is saved locally. Does this have anything to do with this error?