Warding Dragon from behind during it's appear animation will not show its model.

Dragon pit was covered in fog of war using I warded it from jungle connected with dragon pit. Ward was directly opposite to the dragon pit entrance. I guess I warded it at the exact time the dragon appearance animation started as in a second dragon icon appeared on the map, but dragon could not been seen. I needed to go to dragon pit entrance to check its existence and when I checked its model has appeared and the ward could see the dragon after I left.