CNContactViewController hide navigationbar after contactImage fullscreenView

I display contact detail page from my application using following code

let unkvc = CNContactViewController(forContact: Contact)
            unkvc.contactStore = CNContactStore()
            unkvc.delegate = self
            unkvc.allowsActions = true
            self.navigationController?.pushViewController(unkvc, animated: true)

Where Contact is CNContact's object

When its push unkvc controller its show navigation bar its show navigationbar with back button and default edit button on right side. but if contact has image and when i click on image its show fullscreen image but its hide navigation bar when back from image there is no navigation bar so i have no option to go back in my application page. so how to prevent it from hiding navigationbar

edited : I am posting small gif to describe my issue more

This is a known Apple bug apparently.

you can find fixes for this at: https://stackoverflow.com/a/34289350/4734164