I am saving a transaction to a budget and I am trying to fire the didChangeObject delegate function when a new transaction is saved. For delete operation, it is getting called but not for insert.

I initialize my NSFetchedResultsController as shown below:

private func populateTransactions() {
        
        let request = Transaction.fetchRequest()
        request.predicate = NSPredicate(format: "budgetCategory = %@", budgetCategory)
        request.sortDescriptors = [NSSortDescriptor(key: "dateCreated", ascending: false)]
        
        fetchedResultsController = NSFetchedResultsController(fetchRequest: request, managedObjectContext: persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
        fetchedResultsController.delegate = self
        
        do {
            try fetchedResultsController.performFetch()
        } catch {
             print(error)
        }
    }

My view controller is conforming to NSFetchedResultsControllerDelegate. Here is the implementation of didChange delegate function.

func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
        
        guard let indexPath = indexPath else { return }
        
        switch type {
            case .delete:
              
                tableView.deleteRows(at: [indexPath], with: .automatic)
                break
            case .insert:
                tableView.insertRows(at: [indexPath], with: .automatic)
                break
            case .move, update:
                break 
            @unknown default:
                print("default")
        }
        
        
        print("did change")
    }

And finally, here is the saveTransaction function.

private func saveTransaction() {
        
        guard let name = nameTextField.text, let amount = amountTextField.text else {
            return
        }
        
        let transaction = Transaction(context: persistentContainer.viewContext)
        transaction.name = name
        transaction.amount = Double(amount)!
        transaction.budgetCategory = budgetCategory
        transaction.dateCreated = Date()
        
        budgetCategory.addToTransactions(transaction)
        
        do {
            try persistentContainer.viewContext.save()
          
        } catch {
           
        }
    }

Am I missing something. Why is didChange function not called when I insert a new transaction?