iOS 14 Navigation Menu

I'm trying to make use of the new back button menu.

In our app our standard back buttons typically don't have a title, so the UI just displays the <

But, we would like titles displayed in the menu.

I have tried setting

Code Block 
navigationItem.backButtonTitle

but that did not appear to do anything.

If I set the title to

Code Block 
navigationItem.backBarButtonItem?.title

then the title appears in both the menu as well as the UI. Then setting

Code Block 
navigationItem.backButtonDisplayMode = .minimal

(autocomplete says "Don't use a title, just the back button indicator image") also appears to do nothing, as the title is still displayed in the UI

Is this just a bug or do I need to do something else? The end goal is to have a useful menu with titles, but have a minimal back button displayed in the navigation bar.

Thanks