I have the same exact problem. A project compiled with earlier versions of XCode ran fine on older versions of iOS. When I open that older project (or my newer ones) and attempt to debug a device running iOS 12 or iOS 14, I get the same EXC_BAD_ACCESS error. This function was called by the "doInitialization" function... I can see my launch screen from a storyboard displayed, but the code never gets to the app delegate stage. This will prevent me from releasing my app, so watching closely.

The preferences menu option that is available when running an iOS app on an Apple Silicon Mac shows that you are supposed to be able to use "A", "S", "W" and "D" to "tilt" your app. That feels like it's meant to rotate the app. For me, pressing these keys do nothing, but my app happens to take keyboard input and might be filtering out these events or something. I have sent a support request to Apple, but doesn't it feel like there should simply be a "rotate left" and "rotate right" menu option? I have also tried to compile my app and allow ONLY landscape mode. Nope. I even tried changing the launch screens to be Landscape aspect ratio. Nope. If someone knows how to do this, I hope they reply!