title: EXC_BAD_ACCESS with navigation bar title in SwiftUI
body: <p>I'm getting a crash on my iPhone (but not in simulator) whenever I include a navigation bar title in my SwiftUI view. If I take out the navigation bar title everything works just fine, but I need the title there. Here's my code:</p>
  
  <pre><code>NavigationView {
      List {
          ForEach(self.viewModel.tasks) { task in
              TaskRow(task: task)
          }
              .onDelete(perform: self.viewModel.delete(indexSet:))
      }
          .listStyle(.grouped)
          .edgesIgnoringSafeArea(.bottom)
          .navigationBarTitle(Text("mainTitle")) //EXC_BAD_ACCESS crash here
  }
  </code></pre>
  
  <p><strong>UPDATE</strong></p>
  
  <p>I stripped the code above down and started a new project to make sure it wasn't my custom UI or my business logic doing something weird. The code below produces the same crash on my iPhone.</p>
  
  <pre><code>struct ContentView : View {
      var body: some View {
          NavigationView {
              List {
                  ForEach((0...10).identified(by: \.self)) { val in
                      Text("test")
                      }
                  }
                  .listStyle(.grouped)
                  .edgesIgnoringSafeArea(.bottom)
                  .navigationBarTitle(Text("Hey"))
          }
      }
  }
  </code></pre>
  
  <p>Any idea why this is happening or how to fix it?</p>