Identifying Textboxes the have "Text Autofit Improvements"

I've run into this one too.  I'm working with someone who has 360, while I have SL3.  She sent over a file that is unable to be opened.

While doing a screenshare, it's obvious that she never turned this feature on (https://articulate.com/support/article/Storyline-360-Upgrade-Project-Text), as backup copies were never prompted or saved, and she still has the option to turn the text-autofit on.

What we discovered, is that if you copy a textbox from an upgraded project, to a normal one, the entire file is converted, even though it doesn't look like it.  You'll never receive a prompt.  All of the textbox properties still appear with the old settings.