swiftUI navigation rerender issue

//
//  ContentView.swift
//  nav-repro
//
//  Created by Willis Plummer on 3/31/20.
//  Copyright © 2020 Willis Plummer. All rights reserved.
//

import SwiftUI

struct Thing2: Hashable {
  let id: Int
  var name: String
  
  init(id: Int, name: String) {
    self.id = id
    self.name = name
  }
}

struct Thing: Hashable {
  let id: Int
  var arr: [Thing2]
  
  init(id: Int, arr: [Thing2]) {
    self.id = id
    self.arr = arr
  }
}

final class Store: ObservableObject {
  @Published private(set) var value: [Thing]
  
  init(
    initialValue: [Thing]
  ) {
    self.value = initialValue
  }
  
  func changeInnerValue() {
    self.value = self.value.map {thing1 -> Thing in
      var copyThing1 = thing1
      copyThing1.arr = copyThing1.arr.map {x -> Thing2 in
        var c = x
        c.name = "blahhh \(NSDate().timeIntervalSince1970)"
        print(c.name)
        return c
      }
      return copyThing1
    }
  }
}


struct ContentView: View {
  @ObservedObject var store: Store
  
  init(store: Store) {
    self.store = store
  }
    
  func nestedView(idx: Int) -> some View {
    List {
      ForEach(self.store.value[idx].arr, id: \.self) { thing2 in
        NavigationLink(destination: ThirdView()) {
          Text("\(thing2.name)")
        }
      }
    }.navigationBarItems(trailing:
      Button("update") {
        self.store.changeInnerValue()
      }
    ).onAppear {
      print("APPEARS")
      self.store.changeInnerValue()
    }
    
  }

  
  var body: some View {
    NavigationView{
      List {
        ForEach(0..<self.store.value.count) { idx in
          NavigationLink(destination: self.nestedView(idx: idx)) {
            Text("\(self.store.value[idx].id)")
          }
        }
      }
    }
  }
}

struct ThirdView: View {
  var body: some View {
    Text("Some Stuff To See")
  }
}

struct ContentView_Previews: PreviewProvider {
  static var previews: some View {
    ContentView(store: Store(initialValue: [Thing(id: 1, arr: [Thing2(id: 12, name: "BLAH")])]))
  }
}