NSFetchedResultsController - persisted data only

A few things...

1. Stop and make sure you don't have any code performing an automatic save of your context.
2. includesPendingChanges defaults to true. You want it set to false.
3. If all else fails, you need to make all of your changes in a nested context.

Thanks for the info... I've double checked and we're def displaying non-saved core data in the UITableView.

    fileprivate let managedObjectContext = (UIApplication.shared.delegate as! AppDelegate).managedObjectContext /

    lazy var fetchedResultsController: NSFetchedResultsController = { () -> NSFetchedResultsController<NSFetchRequestResult> in

        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Connection")
        fetchRequest.includesPendingChanges = false
     
        let sortDescriptor = NSSortDescriptor(key: "indexPathRow", ascending: true)
        fetchRequest.sortDescriptors = [sortDescriptor]
     
        let fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: self.managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)

        fetchedResultsController.delegate = self
     
        return fetchedResultsController
    }()

These are the properties I'm using for my NSFetchedResultsController. The performFetch happens in viewDidLoad and these are my delegate methods

   func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {tableView.beginUpdates()}
    func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {tableView.endUpdates()}
    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {}
    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, sectionIndexTitleForSectionName sectionName: String) -> String? {return ""}
   
    func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
        switch (type) {
        case .insert: if var indexPath = newIndexPath {
            indexPath.section = indexPath.section + 1
            tableView.insertRows(at: [indexPath], with: .fade)
            }
        case .delete: if var indexPath = indexPath {
            indexPath.section = indexPath.section + 1
            tableView.deleteRows(at: [indexPath], with: .fade)
            }
        case .update: if var indexPath = indexPath {
            indexPath.section = indexPath.section + 1
            tableView.reloadRows(at: [indexPath], with: .none)
            }
        case .move:
            if var indexPath = indexPath {
                indexPath.section = indexPath.section + 1
                tableView.deleteRows(at: [indexPath], with: .fade)
            }
            if var newIndexPath = newIndexPath {
                newIndexPath.section = newIndexPath.section + 1
                tableView.insertRows(at: [newIndexPath], with: .fade)
            }
        }
    }

Finally got back to this - got sidetracked on other work.

Working on a different context as you suggested worked like a charm. Many thanks for the pointers both here and the other thread - much appreciated.