Introspecting NavigationStack breaks iOS 26 Search Tab

[jenyalebid]

Description

Setting .introspect on to a NavigationStack breaks the iOS 26 TabView searchable behavior.

In the below example, without Introspecting, when tapped on search tab it performs the expect iOS 26 animation. With introspect it just switches tab while retaining the top search bar.

import SwiftUI

struct SampleExample: View {
    var body: some View {
        TabView {
            Tab("1", systemImage: "1.square") {
                Sample(label: "1")
            }
            Tab("2", systemImage: "1.square") {
                Sample(label: "2")
            }
            Tab(role: .search) {
                Search()
            }
        }
    }
}

struct Search: View {
    @State private var searchText = ""
    
    var body: some View {
        NavigationStack {
            List {
                Text("Search")
            }
            .navigationTitle("Search")
            .searchable(text: $searchText)
        }
        .introspect(.navigationStack, on: .iOS(.v26)) { stack in // Search tab is not working properly with this.
            
        }
    }
}

struct Sample: View {
    var label: String
    
    var body: some View {
        NavigationStack {
            List {
                Text(label)
            }
            .navigationTitle(label)
        }
    }
}

Checklist

• I have read the README before submitting this report.
• This issue hasn't been addressed in an existing GitHub issue or discussion.

Expected behavior

No response

Actual behavior

No response

Steps to reproduce

1. Remove the .introspect to see correct behavior, and add back (already in sample code) to see the issue.

Version information

1.4.0

Destination operating system

iOS 26.0

Xcode version information

Xcode 26.0.0

Swift Compiler version information