[iOS] NotificationServices.localNotifications is empty when game is minimized

Hi, I'm using UnityEngine.iOS.NotificationServices on iOS for local notifications. Unity 5.6.4. Does anyone know why after clicking on the notification when the game is minimized NotificationServices.localNotifications is empty? While when you click on the notification when the game is not running then it all works as it should and localNotifications contains the clicked notification.