Text editing bug changes font of new text??

I'm hoping I'm not the only one experiencing this?

Currently running Illustrator 29.1 (awaiting to install 29.2.1) on Intel i5 2020 iMac 27" with Sequoia 15.2.

For the last few weeks, I've noticed that when editing or adding to existing text, any new content that I add is added in another font entirely - in this video, when I add to existing text in American Typewriter, new text is added in Helvetica!

It's not just reverting to Helvetica, I've had it revert to Gotham, Avenir, Times New Roman (and a few more which I can't name).

This problem does not seem to be linked to specific font coding e.g. OpenType; as it is happens to locally installed TrueType and Adobe cloud-hosted fonts too.

I've seen guidance of it being localised to 29.1, and to revert back to 29.0 while the issue is looked at; however I started having the problem while I had 29.0 installed.

Any advice woud be miuch appreciated - thanks.