SwiftUI .toolbar(.keyboard) Not Showing on First Appearance in fullScreenCover (iOS 18)

I’m encountering an issue in iOS 18.5 (and most probably across all iOS 18 versions) where the keyboard toolbar defined with .toolbar(.keyboard) does not appear immediately when a TextField becomes first responder inside a fullScreenCover. Here’s a minimal reproducible example:

import SwiftUI

struct ContentView: View {
    
    @State private var text: String = ""
    @State private var showSheet: Bool = false
    
    var body: some View {
        NavigationStack {
            Button("Show Sheet") {
                showSheet.toggle()
            }
            .fullScreenCover(isPresented: $showSheet) {
                NavigationStack {
                    VStack {
                        Button("Dismiss") {
                            showSheet.toggle()
                        }
                        TextField("Enter text", text: .constant("Hello"))
                            .autocorrectionDisabled()
                            .textInputAutocapitalization(.never)
                    }
                    .padding()
                    .toolbar {
                        ToolbarItemGroup(placement: .keyboard) {
                            toolBar
                        }
                    }
                }
            }
        }
    }
    
    private var toolBar: some View {
        HStack {
            Spacer()
            Button("Done") {
                UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
            }
        }
    }
}

✅ Expected Behavior:

• When the TextField becomes active and the keyboard appears, the custom keyboard toolbar with a “Done” button should also appear immediately.

❌ Actual Behavior:

• On first presentation of the sheet and focusing the TextField, the toolbar is missing.
• If I background the app and return, the toolbar appears as expected.
• Dismissing and re-opening the sheet leads to the same issue (toolbar missing again).