Hello colleagues, According to [Android for Cars App Library design guidelines 1.3-beta](https://developer.android.com/static/training/cars/Android%20for%20Cars%20App%20Library%20design%20guidelines.pdf) @ page 65: [PlaceListNavigationTemplate](https://developer.android.com/reference/androidx/car/app/navigation/model/PlaceListNavigationTemplate) should have a header element.<br />Please take a look sample code, [PlaceListNavigationTemplate](https://github.com/android/car-samples/blob/main/car_app_library/showcase/common/src/main/java/androidx/car/app/sample/showcase/common/navigation/PlaceListNavigationTemplateDemoScreen.java) @ line 89: ` .setHeader(header)` But, it doesn't appear on screen:  Could you please help us solve this issue?