SwiftUI: Why does @State work, and not @StateObject

Question

Why does @State and @ObservedObject causes the SwiftUIView to be redrawn and updated correctly, but not when using @StateObject?

Thanks

public class Model: ObservableObject {
    @Published public var randomStrings: [String] = []
}

class DebugTestVC: UIViewController {
    // ***** WORKS *****: 
    @State var model = Model() 
    
    // ***** WORKS *****: 
    @ObservedObject var model = Model()
    
    // ***** NOT WORKING *****: 
    @StateObject var model = Model()

    override func viewDidLoad() {
        super.viewDidLoad()

        model.randomStrings = ["1", "2"]

        let vc = UIHostingController(rootView: SwiftUIView(model: model))
        vc.view.frame = UIScreen.main.bounds
        
        addChild(vc)
        view.addSubview(vc.view)
        vc.didMove(toParent: self)
    }
}

struct SwiftUIView: View {
    @ObservedObject var model: Model
    
    var body: some View {
        VStack {
            ForEach(model.randomStrings, id: \.self) { string in
                Text(string)
            }
        }
    }
}