New `.animation(_:body:)` overload confusion

Hi folks,

I’ve been trying to use the new .animation(_:body:) overload without success. I’m attempting to animate multiple properties of a view, each with different animations. This overload seems to be the perfect candidate to achieve that.

Here's the code I'm using:

struct ContentView: View {
  @State private var isAnimating = false
  
  var body: some View {
    Text("Hello World")
      .font(.largeTitle)
      .animation(.easeOut(duration: 1)) {
        $0.foregroundStyle(isAnimating ? .red : .blue)
      }
      .animation(.linear(duration: 10)) {
        $0.offset(x: isAnimating ? -100 : 0)
      }
      .onAppear {
        isAnimating = true
      }
  }
}

Pretty straightforward, but I don’t get any animations at all.
Of course, I could wrap isAnimating = true in a withAnimation closure, but the WWDC session about those APIs mentions this is not needed. Furthermore, if I do that, the animations I provide in .animation(_:body:) are not being used.

I’m really confused by this new API, and I’m starting to think it doesn’t work as advertised.