iPad parent child refreshing issue - onAppear is NOT getting called every single time.

This code works well in iPhone but not on iPad. In iPad, although the "Selected topic" text in TopicDetailView changes with every list selection, **onAppear is NOT getting called every single time. **

I need to do some backend operation on onAppear here. What am I doing wrong here? At first it looks like working fine, but go backward tapping in list, random tapping, every time, "selected topic " changes, but NOT every time onAppear gets called. I must have the onAppear called every time to run backend operations. I have latest devices, simulators, Xcode as of today. I cannot use NavigationStack as I need to support ios15.0 onwards

import SwiftUI
  
struct TopicsView: View {
    var topics = ["Topic1","Topic2","Topic3"]
    var body: some View {
        NavigationView {
            List(topics, id:\.self ) { topic in
                        NavigationLink(
                            destination: TopicDetailView(topic: topic).id(UUID())
                          ) {
                            Text(topic)
                          }
                    }
        }
    }

}


struct TopicDetailView: View {
     var topic: String
 
     var body: some View  //body{
    {
        VStack{
            Text("Selected topic \(topic)")
         }
         .onAppear(){
            print("on appear on topic \(topic)")
        }
         .onChange(of: topic){ v in
             print("on change to topic \(v)")
         }
    }
}


struct ContentView: View {
    var body: some View {
        TopicsView()
    }
    
    
 }