inCopy/inDesign Fonts Suddenly Unavailable

Got a weird one. Suddenly inCopy (and inDesign) are splitting a font that I've used regularly in the past into pieces, rendering them unusable. Minion Variable Concept, which originally just had Regular, Italic, etc. options. now has a slew of "Text-9.500" etc. options, each relating to a different font size. See attached. So now when I open a file that uses these, all these "Text-10.000" etc. fonts are missing. 

My designer is using the same version of inDesign that I have and the same fonts (he re-sent me the font files, just to confirm) and has no issues. Weirder, if I open an old .indd from a project three months ago, which worked perfectly at the time, I get the same font errors. Even worse: This seems to be making both inDesign and inCopy crash. 

I've reinstalled both inCopy and inDesign multiple times, reinstalled the font, tried multiple different files, etc. No luck. macOS 15.5, tried it in inCopy 20.4.1 and 20.4.

Has anyone seen an issue like this before? Its making both of these pieces of software unusable.