Hello Chris,
I had the same problem. I’m using After effects 2021, and font is: “Arsen script” from Envato elements.
Here what I have found on the web:
If you copy/paste text, it will not trigger the apostrophe, but if you put cursor to the right place in text and press alt + the button for apostrophe, it will work. So you must manually input apostrophes every time. Sometimes you don’t need the alt, try both ways… It’s confusing, i know…
BTW, I’m using Serbian keyboard, so it is even more complicated – just use the “Ć” symbol on your keyboard.
I hope this will help someone because I could not find anything on the web and I really needed help with this problem.