a simple reproduction could be

import SwiftUI

struct ContentView: View {
    @State private var paths = [String]()
    
    @Namespace var ns
    
    var body: some View {
        NavigationStack(path: $paths) {
            ScrollView {
                Button("Push") {
                    paths.append("a")
                }
                .matchedTransitionSource(id: "a", in: ns)
            }
            .navigationDestination(for: String.self, destination: { id in
                Text(id)
                    .navigationTransition(.zoom(sourceID: "a", in: ns))
            })
        }
    }
}

#Preview {
    ContentView()
}

the push button just remains invisible after you come back from the second level view