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This is a build error with XCode Beta 4, Swift, and framework targets with BUILD_LIBRARY_FOR_DISTRIBUTION set to yes so I can build an XCFramework. I'm seeing if anyone else has seen this and can help me out.When BUILD_LIBRARY_FOR_DISTRIBUTION to No, then everything can build and archive just fine. When BUILD_LIBRARY_FOR_DISTRIBUTION is Yes I get a bunch of these errors:@IBOutlet property cannot have non-'@objc' class type 'UIImageViewSubclass'Method cannot be marked @IBAction because the type of the parameter cannot be represented in Objective-CThe only thing I can see in common with all the failures is that each class is itself a subclass of another, and that other class is a direct subclass of a UIKit object. Ones that are direct subclasses do not give the error.So this works (one level):@IBDesignable open class MyLabel: UILabel// Compiles fine@IBOutlet weak var confirmPasswordErrorLabel: MyLabel!This fails (two levels):@IBDesignable open class MyImageView: UIImageViewopen class MyCardImageView: MyImageView// Emits an error when BUILD_LIBRARY_FOR_DISTRIBUTION is Yes@IBOutlet weak var cardImageView: MyCardImageView!