title: NavigationView bar material invisible on iOS 15
body: <p>On iOS 15, an app with a <code>NavigationView</code> with <code>.inline</code> mode no longer shows the blurry material color you would see for the navigation bar.</p>
  <p>Example code:</p>
  <pre><code>struct ContentView: View {
      var body: some View {
          NavigationView {
              ZStack {
                  Color.red.ignoresSafeArea()
                  
                  Text(&quot;Content&quot;)
              }
              .navigationBarTitleDisplayMode(.inline)
          }
      }
  }
  </code></pre>
  <p>Comparison:</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>iOS 14.4</th>
  <th>iOS 15</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td><a href="https://i.stack.imgur.com/SWIjp.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SWIjp.png" alt="iOS 14.4 result" /></a></td>
  <td><a href="https://i.stack.imgur.com/Tyzfq.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Tyzfq.png" alt="iOS 15 result" /></a></td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>How can I fix this to keep the iOS 14 behaviour?</p>