MapKit bus stations

I want to see all the public transport stations on my MKMapView. With the following code I get train stations on the map:

mapView.pointOfInterestFilter = MKPointOfInterestFilter(including: [.publicTransport])

But the bus stops are missing. If I use the Apple Maps app and chose Transit as the map, the bus stops are available there.

How can I get the bus stops in my app using MKMapView?