In navigationLink closure, FocusState doesn't work in sheet

Hello, I have a question about FocusState, navigationLink and sheet, the code which in navigationLink closure doesn’t work, but work without navigationLink, just like the following code

struct ContentView: View {
    var body: some View {
        NavigationStack {
            // this work
            interView()
            
            // this doesn't work
            NavigationLink { 
                interView()
            } label: { 
                Text("into interView")
            }
        }
    }
}

struct interView: View {
    
    @FocusState var focusStateA : Int?
    @State var show : Bool = false
    @State var text: String = ""
    
    var body: some View {
        ScrollView {
            VStack {
                coreView
                Button("Detail") { 
                    show.toggle()
                }
            }
            .sheet(isPresented: $show, content: {
                coreView
            })
        }
    }
}


extension interView {
    var coreView : some View {
        VStack {
            VStack {
                putdown
                TextField("hi", text: $text)
                    .focused($focusStateA , equals: 1)
            }
        }
    }
    
    var putdown : some View {
        Button(action: {
            if focusStateA != nil {
                focusStateA = nil
                print("OK")
            } else {
                print("It's nil")
            }
        }, label: {
            Text("Put down the keyboard")
        })
    }
    
}

and there are some strange phenomena, I must put all view into a scrollview, otherwise, it even doesn’t work without navigationLink

This problem has existed in IOS 18, and now in IOS26 still doesn’t be settled, is it a problem or some character?