Failure to cast Family Controls Error to FamilyControlsError

When asking for ScreenTime permission from users, were are seeing cases where

guard let error = error as? FamilyControlsError else {           
     print(String(describing: error)
     print("\n")
     print(error.localizedDescription)
     return
}

prints

Error Domain=FamilyControls.FamilyControlsError Code=5 "(null)"

The operation couldn’t be completed. (FamilyControls.FamilyControlsError error 5.)

We've also seen this with error code 4 and 7. Why are these failing to cast to FamilyControlsError?