title: App crashes on iPhone 6, iOS 12.5 while testing in device using Xcode 13.2
body: <p>Console:</p>
  <pre><code>dyld: Symbol not found: ___chkstk_darwin
    Referenced from: /private/var/containers/Bundle/Application/6A606806-B567-4237-9B63-561126BF5E96/Appname.app/Frameworks/libswift_Concurrency.dylib (which was built for iOS 13.0)
    Expected in: /usr/lib/libSystem.B.dylib
   in /private/var/containers/Bundle/Application/6A606806-B567-4237-9B63-561126BF5E96/Appname.app/Frameworks/libswift_Concurrency.dylib
  </code></pre>
  <p>the app is running smoothly in the simulator with iOS 12.4</p>
  <p>I tried making <code>libswift_Concurrency.dbt</code> optional. It did not stop the app from crashing.</p>