EditButton when nested in an outer NavigationView doesn't work?

I've build a form with a list of items. It's nested in a NavigationView with an EditButton, and works properly in preview. It needs to live nested via a NavigationLink in another view, however, and when previewed (or run in the simulator) that way the edit button causes a reaction that looks like a new view animating in, but that view is not editable.


Why would this be? I've seen some material that uses the term edit scope, but I don't see what that is nor how it's controlled.


Thanks