Swift СoreData Predicate returns without one record

Question

Such a problem that in one screen my getCount function returns for example 5 records

guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
      return
    }
    var managedContext = appDelegate.persistentContainer.viewContext
    
      managedContext = appDelegate.persistentContainer.viewContext
     print(getCount(viewContext2:  managedContext)) // 5


func getCount(viewContext2:  NSManagedObjectContext)-> Int{

let fetchRequest: NSFetchRequest<Cart> = Cart.fetchRequest()

fetchRequest.predicate = NSPredicate(format: "real_id == %@","2086" )

do {
let resCart1ById2 =  try  viewContext2.fetch(fetchRequest)
     
    return resCart1ById2.count //   5 
} catch let error as NSError {
    print(error)
}
return -1

}

When switching to another child screen, the same function returns 4, does not see one record How can the problem be solved?