Check the help for confirmationDialog. It states On iOS, tvOS, and watchOS, confirmation dialogs only support controls with labels that are Text. Passing any other type of view results in the content being omitted.

Try this struct ButtonAnimationTest: View { @State var showButton: Bool = true var body: some View { VStack { if showButton { Button("makeTransition") { withAnimation { showButton.toggle() } } .buttonStyle(MyButtonStyle()) .padding() .background(Color.black) .transition(.slide) } } .animation(.easeIn(duration: 1), value: showButton) } }

Some useful tips here -> SO

Seeing the same error in our production app.

struct ContentView: View {     @State private var sliderValue = 50.0     @State private var showSlider = true     var body: some View {         VStack {             BullSlider(value: $sliderValue, in: 1.0...100.0)                 .opacity(showSlider ? 1 : 0)             Button("Toggle") {                 withAnimation {                     showSlider.toggle()                 }             }             .padding()         }     } } struct BullSlider: View {     @Binding var value: Double     var bounds: ClosedRange<Double>     init(value: Binding<Double>, in bounds: ClosedRange<Double>) {         self.bounds = bounds         self._value = value     }     var body: some View {         Slider(value: $value, in: bounds)             .onAppear{                 let thumbImage = ImageRenderer(content: bullThumb).uiImage ?? UIImage()                 UISlider.appearance().setThumbImage(thumbImage, for: .normal)             }     }     var bullThumb: some View {         VStack {             ZStack {                 Circle()                   .frame(width: 50, height: 50)                   .foregroundColor(.white)                 Circle()                   .strokeBorder(lineWidth: 6)                   .frame(width: 44, height: 44)                 Circle()                   .strokeBorder(lineWidth: 6)                   .frame(width: 24, height: 24)             }             .foregroundColor(.blue)         }         .frame(width: 50, height: 60)     } }