Unexpected behavior when replacing @State for @AppStorage in DisclosureGroup

Initially, I had a property with the @State wrapper to define whether or not a DisclosureGroup is expanded. When expanded, the numbers have a nice animation where they appear one by one (this does not show on the Canvas, it has to be run on a sim or device).

struct ExampleView: View {
    @State var isExpanded = false
    
    var body: some View {
        DisclosureGroup(isExpanded: $isExpanded) {
            ForEach(1..<10) { num in
                Text("\(num)")
            }
        } label: {
            Text("Example")
                .foregroundColor(.black)
        }
    }
}

When I replaced @State for @AppStorage("isExpanded") I expected the behavior to be the same, but when expanding I got shown all numbers at once, while the title of the DisclosureGroup was still moving up.

Is this expected? Should I file a bug report?