UNNotificationAction sometimes not showing in remote notification

I have registered the UNNotificationAction's in appdelegate with the identifier, also i have added that identifier in info.plist in notification extension. Buttons are visible if i install the app, after killing the app buttons are not visible. Also i have cross checked with the category identifier. Its working fine in sample application but the behaviour is weird when i integrate it in the app.

UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
UNNotificationAction *action = [UNNotificationAction actionWithIdentifier:@"next"
  title:actionTitle1
  options:UNNotificationActionOptionNone];

UNNotificationAction *action2 = [UNNotificationAction actionWithIdentifier:@"goto"
  title:actionTitle2
  options:UNNotificationActionOptionNone];

UNNotificationCategory *category = [UNNotificationCategory categoryWithIdentifier:@"category_identifier"
  actions:@[action,action2] intentIdentifiers:@[]
  options:UNNotificationCategoryOptionNone];
NSSet *categories = [NSSet setWithObject:category];
[center setNotificationCategories:categories];