Xcode 15 beta 5 / Watch OS 10 beta: .navigationBarBackButtonHidden(true) doesn't work with .sheet

Currently, I am adapting my app to watchOS 10 and the new navigation options. However, I want to keep the page call via PresentationAdaption .sheet, but using .navigationBarBackButtonHidden(true). In Xcode 14 and under watchOS 9 this has not been a problem so far, but in the new version the back button, newly introduced in watch OS 10, still appears. Is this a bug or a feature? And how do I get rid of this button?

Circle()
.onTapGesture {
 justDoIt = true
}
.sheet(isPresented: $justDoIt) {
View() 
}
.navigationBarBackButtonHidden(true)