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I'm trying to get our project to compile on Xcode 13 beta 5. Previous betas have failed to compile the project because of a dependency, but thankfully that change was rolled back in beta 5 so now all of our dependencies are compiling, but I don't know if the app code was broken before now.

I'm getting an error on one of my subclasses about actor isolation. I have made no changes from what compiles successfully in Xcode 12, so nothing in the app (or dependencies) is explicitly marked @MainActor. What's very odd is that if I pull out this class and it's superclass into a new project, they compile just fine. I'm not sure where to even begin to figure out how to resolve this as I don't see how it's becoming actor isolated.

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I've also run into this issue. Check to see if your child class is conforming to a UIKit/Apple protocol that has a @MainActor attribute. In my case, it was a UIGestureRecognizerDelegate. A solution would be to mark your parent class with @MainActor, however this will bring about more compile errors that you'd need to address.