Stored Properties don't always override a protocol extension

Hi,

I thought overriding the default implementation of a protocol extension in a subclass works like overriding a method. Instead, methods don't take into account the overridden implementations of the subclass. It's a bit complicated, so here's an example:

import UIKit
protocol MyProtocol {
    var myProperty: String? { get }
}
extension MyProtocol where Self: UIViewController {
    var myProperty: String? {
        return "This comes from the Extension"
    }
}
extension UIViewController: MyProtocol {
    func whatIsMyProperty() -> String? {
        return myProperty
    }
}
class SpecialViewController: UIViewController {
    var myProperty: String?
   
    func whatIsMyProperty2() -> String? {
        return myProperty
    }
}
let viewController = SpecialViewController()

viewController.myProperty //nil
viewController.myProperty = "I set this"
viewController.myProperty // "I set this"
viewController.whatIsMyProperty()  // "This comes from the Extension"
viewController.whatIsMyProperty2()  // "I set this"

To me this is very counter intuitive. Can I access the new stored property somehow in whatIsMyProperty() in UIViewController without adding anything but the stored property itself to the subclass?

Thanks!

Gernot.