ios – Environment variable does not propagate through NavigationLink

I have a custom environment variable, like:

public enum Something: CaseIterable {
    case thing
    case other
}

public struct SomethingKey: EnvironmentKey {
    public static var defaultValue: Binding<Something> = .constant(.thing)
}

public extension EnvironmentValues {
    var something: Binding<Something> {
        get { self[SomethingKey.self] }
        set { self[SomethingKey.self] = newValue }
    }
}

public extension View {
    func something(_ value: Binding<Something>) -> some View {
        environment(\.something, value)
    }
}

I wish to pass it on at the top level view. But this didn’t work, the environment variable kept its default value. I found out it does not seem to propagate through a NavigationLink, as I show below:

    @State var something: Something = .thing // Is being set by a Picker(); code not shown.

...

            NavigationLink(destination: TabView {
                    MyView()
                        .something($something) // Works here.
                }
                .something($something) // Works here also.
            ) {
                Text("Tab")
            }
            .something($something) // Does NOT work here.

Why is that and what can I do about it?