iOS NavigationView toolbar spacing behavior differences across apps

Question

I'm building an iOS framework that provides certain UI components for various consuming apps. In one of the UI components, I'm presenting a bottom sheet with a NavigationView overlaid with a ZStack for color.

In my test app, everything looks correct. The content of the NavigationView sits just below the navigation toolbar/title as expected.

But, when I install the framework into a production app, the content ends up underneath the NavigationView toolbar/title area.

I think I've narrowed it down to a problem with the SafeAreaInsets, but I'm not sure how to solve it. It seems like some default is overriding what I expected.

Any tips on how to solve this?

Here's my code:

import Foundation
import SwiftUI

struct MyView : View {
    var body: some View {
        NavigationView {
            ZStack {
                Color(UIColor(.blue)).edgesIgnoringSafeArea(.all)
                HStack(alignment: .top) {
                    VStack(alignment: .leading) {
                        Text("Your encryption key is already saved to your iCloud keychain. To view your key or transfer it to another device, tap below.")
                                .fixedSize(horizontal: false, vertical: true)
                    }
                }
            }
        }
    }
}

Here's the correct display:

And what I see for insets on this one:

Here's the incorrect display:

And the safe area insets on the incorrect one: