Embedding a NavigationStack within the detail view of a NavigationSplitView

Can you share a code example that replicates the issue here? We're tracking similar bugs, but your callout of an explicit stack in the detail column is a configuration we haven't yet seen this issue with.

Thanks for your reply - I've submitted FB12171134. Here's a minimal code example to reproduce (I appreciate the Stack here doesn't achieve anything, but the behaviour is the same):

class Row: Identifiable, Hashable {
    let id: UUID
    let title: String
    
    init(title: String) {
        self.id = UUID()
        self.title = title
    }
    
    static func == (lhs: Row, rhs: Row) -> Bool {
        return lhs.id == rhs.id
    }
    
    func hash(into hasher: inout Hasher) {
        hasher.combine(id)
    }
}

struct ContentView: View {
    let rows = [Row(title: "Row 1"), Row(title: "Row 2"), Row(title: "Row 3")]
    @State var selectedRow: Row?
    
    var body: some View {
        NavigationSplitView {
            List(selection: $selectedRow) {
                ForEach(rows) { row in
                    NavigationLink(value: row) {
                        Text(row.title)
                    }
                }
            }
            .navigationTitle("Root List")
        } detail: {
            if let selectedRow = selectedRow {
                RowView(row: selectedRow)
            }
        }
    }
}

import SwiftUI

struct RowView: View {
    let row: Row
    
    var body: some View {
        NavigationStack {
            VStack {
                Text("Detail View")
            }
            .navigationTitle(row.title)
            .toolbar {
                ToolbarItem(placement: .navigationBarTrailing) {
                    Button {
                        // Empty
                    } label: {
                        Label("Add", systemImage: "plus")
                    }
                }
            }
        }
    }
}

I am experiencing the same issue but haven't found a solution as of yet.

Is there any movement on this issue?

Dear Aaron, pls join Apple's SwiftUI team and fix it yourself, it's your best hope. Best regards, Tony

Experiencing the same on iOS 17.2 beta 3, the delay with which .toolbar appears is very noticeable

Here is an example, the toolbar items appear with delay in detail view.