Sample App that reproduces a bug on the nav bar
The app reproduces a bug with the nav bar items.
When the UIKit button is tapped it pushes a default UIViewController (called UiKitViewController). When the SwiftUI button is tapped it pushes a UIHostingController (called SwiftUiViewController).
Both controllers set up its navigation items on viewDidLoad.
The issue is that on the SwiftUiViewController the UIBarButtonItem initialized with a custom view, UIBarButtonItem(customView:), disappears after a second.