iOS 15 beta 4: AttributedString with Markdown not rendering in Text in SwiftUI?

I assumed this was a iOS 15 beta 1 or 2 bug, but as of beta 4 I'm still seeing this behavior, so perhaps I'm doing something wrong: Text is supposed to render AttributedStrings with Markdown. It appears to render correctly when a direct String literal is passed into the Text, but not when the AttributedString is a variable. Am I doing something super dumb?

struct ContentView: View {
    var text = AttributedString("**Hello**, `world`! Visit our [website](https://www.capitalone.com).")

    var body: some View {
        VStack {
            Text("**Hello**, `world`! Visit our [website](https://www.capitalone.com).")
                .padding()

            Text(text)
                .padding()
        }
    }
}