Can't navigate to parent route

[sanmadjack]

If I set up this route:

..addRoute(
    name: "items",
    path: "items",
    defaultRoute: true,
    enter: enterRoute,
    mount: (router) => router.addRoute(
      name: "item_view",
      path: "/view/:itemId",
      defaultRoute: false,
      enter: enterRoute)
)

And navigate to #items/view/1, it goes to the correct route, but if I subsequently navigate back to #items, it doesn't trigger enterRoute.