title: SwiftUi app with 2.0 features runs to iOS, iPadOS but not MacOS
body: <p>I am receiving the following error when running a multi platform SwiftUI app with 2.0 features to a an iMac running Catalina 10.15.7 from XCode 12 beta 4 (12A8179i). The project builds for Mac but fails to run.</p>
  <p>dyld: Symbol not found: _$s4Body7SwiftUI3AppPTl
  Referenced from: /Users/jamesallison/Library/Developer/Xcode/DerivedData/CC0_Notes2-bsyhdjklfidgkicvoddwslyeyjia/Build/Products/Debug-maccatalyst/CC0 Notes2.app/Contents/MacOS/CC0 Notes2 (which was built for Mac OS X 14.0)
  Expected in: /System/iOSSupport/System/Library/Frameworks/SwiftUI.framework/Versions/A/SwiftUI
  in /Users/jamesallison/Library/Developer/Xcode/DerivedData/CC0_Notes2-bsyhdjklfidgkicvoddwslyeyjia/Build/Products/Debug-maccatalyst/CC0 Notes2.app/Contents/MacOS/CC0 Notes2
  <a href="https://i.stack.imgur.com/JFSM4.jpg" rel="nofollow noreferrer">Project Settings</a></p>
  <p>The App runs fine to an actual iPhone and an iPad running the latest OS versions. Am I missing something in my settings? Should I be embedding the frameworks? Thanks</p>
  <p>(lldb)</p>