didSet() not called anymore for a @Published Bool when using toggle()

Until iOS 13.4 I was using a property observer to update the UserDefaults for a @Published Bool value

    @Published var mutedAudio: Bool = UserDefaults.standard.bool(forKey: "mutedAudio") {
        didSet { UserDefaults.standard.set(self.mutedAudio, forKey: "mutedAudio") }
    }

With the first beta of iOS 13.4 didSet() is not called anymore if I use in SwiftUI the toggle() method and I must use a logical negation:

Button(action: {
    // self.settings.mutedAudio.toggle()  doesn't work in iOS 13.4
    self.settings.mutedAudio = !self.settings.mutedAudio // workaround
}) {
    Image(systemName: settings.mutedAudio ? "speaker.slash.fill" : "speaker.2.fill").resizable().frame(width: 24, height: 24)
}

Is there a better solution than waiting for the next iOS 13.4 beta? 🙂