Font becomes OTF & is missing when different people open the file
ID 21.4.1, Mac
I built a file in InDesign without issues.
We just started experiencing an issue in which when someone else opens the file, the fonts (Barlow) appear to be missing, and show up like this:

I was able to get the fonts working by disabling them, and letting ID re-enable them.
However, when I opened a different copy of the same file, Medium and Medium appeared to be missing again, though I found I could also “fix” them by using Type > Find/Replace.

I assume that if I open up a copy someone else was working on, I may experience the same issue.
Any ideas what may cause this? It’s concerning, and we haven’t seen this before.
Thanks
