Weird Overlay draw behaviour when zooming in the MapView [android]

Question

I've extended Overlay and implemented draw() in order to draw some stuff onto the map. When zooming is done through mapController.zoomIn() (called when doubleTapping the map), the overlay is drawn properly onto the map.

BUT whenever I zoom in/out with the built in zoom controller, the overlay is not drawn properly and panning the map is needed to get the overlay refreshed.