Leptos router gives a warning which I do not unterstand

I stared to experiment with https://github.com/gbj/leptos/ using the current main branch from Git. Following the router example I get the following warning in my console in the browser:

WARNING: You are providing a context of a type (leptos_reactive::memo::Memo<leptos_router::components::routes::RouterState>)that's already been provided higher in the context tree. If this is unintentional, there's a chance it will cause bugs, because the value of the context is now 'shadowed' in the lower parts of the tree.

I understand the message, but I have no idea what I'm doing wrong. My router component looks like this:

#[component]
pub fn Playground(
  cx: Scope,
) -> impl IntoView {

  view! { cx,
      <Router>                                                                                                                                 
          <nav>                                                                                                                                
              <A exact=true href="/">"Simple"</A>                                                                                              
              <A href="demo1">"Demo 1"</A>                                                                                                     
              <A href="demo2">"Demo 2"</A>                                                                                                     
          </nav>                                                                                                                               
          <main>                                                                                                                               
              <Routes>                                                                                                                         
                  <Route                                                                                                                       
                      path="/"                                                                                                                 
                      view=move |cx| view! { cx, <SimpleComponent/> } />                                                                       
                  <Route                                                                                                                       
                      path="demo1"                                                                                                             
                      view=move |cx| view! { cx, <Demo1 /> } />                                                                                
                  <Route                                                                                                                       
                      path="demo2"                                                                                                             
                      view=move |cx| view! { cx, <Demo2 /> } />
              </Routes>
          </main>
      </Router>
  }
}