Missing Fonts error message? Clarendon BT

The last time i updated our keynote presentations (12 of them) was in march of 2020.

We needed to make changes and I opened one of them up to a missing fonts error message.

I guess keynote was updated with a catalina update.

I do not have missing fonts as I created them to be specifically viewed on an ipad (limited fonts on an ipad) without the presenter seeing a font missing message.

Now it says there are missing fonts and a font that is not even on my computer that was never used, obviously. It is CLARENDON BT.

Where did this come from?

I fixed the issue with someone’s suggestion of exporting it to powerpoint then opening it back up and saving as a new keynote, which removed the fonts missing message.

But, I have to redo all my paragraph style again, as they are generic, which is fine if I have no error messages.

But why did this unknown font get into a fonts missing error message?