Trying to use @observableobject and @EnvironmentObject, but changes in subviews don't propagate

ContentView.swift

class Person: RawRepresentable, ObservableObject {
    @Published var name: String
    @Published var age: Int

    // RawRepresentable
    var rawValue: String {
        get {
            let value = "\(name):\(age)"
            print("Returning raw value: "+value)
            return value
        }
    }

    required init?(rawValue: String) {
        if rawValue == "" {
            print("Initialised with empty rawValue, setting defaults")
            self.name = "Jonny Appleseed"
            self.age = 42
            return
        }
        print("Initialising with rawValue: \(rawValue)")
        let parts = rawValue.split(separator: ":")
        self.name = String(parts[0])
        self.age = Int(parts[1])!
    }
}

struct ContentView: View {
    @AppStorage("person") var person: Person = Person(rawValue: "")!

    var body: some View {
        ContentSubview().environmentObject(person)
    }
}

struct ContentSubview: View {
    @EnvironmentObject var person: Person
    var body: some View {
        VStack {
            TextField("Name: ", text: $person.name).padding()
            TextField("Age: ", value: $person.age, formatter: NumberFormatter()).padding()
        }
    }
}