title: Catalyst 'SwiftUI.AccessibilityNode' is not a known serializable element
body: <p>I created a fresh iOS Single Page App (including SwiftUI) with Xcode 11.1 and enabled Mac Catalyst. After running the fresh Project on my Mac (macOS 10.15 of course) I get the following errors after tapping once on the window.</p>
  
  <pre><code>2019-10-18 12:59:48.479186+0200 test[3130:122148] Metal API Validation Enabled
  2019-10-18 12:59:50.960734+0200 test[3130:122148] [AXRuntimeCommon] Unknown client: test
  2019-10-18 12:59:50.962261+0200 test[3130:122148] [AXRuntimeCommon] This class 'SwiftUI.AccessibilityNode' is not a known serializable element and returning it as an accessibility element may lead to crashes
  2019-10-18 12:59:51.313 test[3130:122148] **************_____________**************AXError: AVPlayerView is not a kind of NSView
  1   AccessibilityBundles                0x00007fff42ee3b69 _AXBValidationCheckIsKindOfClass + 201
  2019-10-18 12:59:51.386 test[3130:122148] **************_____________**************AXError: MKStarRatingView is not a kind of NSView
  1   AccessibilityBundles                0x00007fff42ee3b69 _AXBValidationCheckIsKindOfClass + 201
  </code></pre>
  
  <p>Note: I also removed the Sandbox capability otherwise I get error about can't writing <code>ApplicationAccessibilityEnabled</code> </p>
  
  <p>Does anyone know how to solve that?</p>