@Published property wrapper not working on subclass of ObservableObject

I have a class conforming to the @ObservableObject protocol and created a subclass from it with it's own variable with the @Published property wrapper to manage state.


It seems that the @published property wrapper is ignored when using a subclass. Does anyone know if this is expected behaviour and if there is a workaround?


I'm running iOS 13 Beta 8 and xCode Beta 6.


Here is an example of what I'm seeing. When updating the TextField on ```MyTestObject``` the Text view is properly updated with the aString value. If I update the ```MyInheritedObject```TextField the anotherString value isn't updated in the Text view.


import SwiftUI

class MyTestObject: ObservableObject {
    @Published var aString: String = ""
}

class MyInheritedObject: MyTestObject {
    @Published var anotherString: String = ""
}

struct MyView: View {
    @ObservedObject var myTestObject = MyInheritedObject()
    @ObservedObject var myInheritedObject = MyInheritedObject()

    var body: some View {
        NavigationView {
            VStack(alignment: .leading) {
                TextField("Update aString", text: self.$myTestObject.aString)
                Text("Value of aString is: \(self.myTestObject.aString)")
              
                TextField("Update anotherString", text: self.$myInheritedObject.anotherString)
                Text("Value of anotherString is: \(self.myInheritedObject.anotherString)")
            }
        }
    }
}