Mysterious core data behavior retrieves empty objects in second sample

I am trying to display a list of objects from Core Data in a UITableViewController. Here is the viewWillAppear of this UITableViewController:

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    self.landmarks = [[TSDataManager sharedInstance] fetchArrayFromDBWithEntity:@"Landmark" forKey:nil withPredicate:nil];
    [self.tableView reloadData];
}

      

        
        
        
      

    

And here is fetchArrayFromDBWithEntity: forKey: withPredicate: implementation:

- (NSMutableArray*)fetchArrayFromDBWithEntity:(NSString*)entityName forKey:(NSString*)keyName withPredicate:(NSPredicate*)predicate {
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:self.managedObjectContext];
    [request setEntity:entity];

    if(keyName != nil){
        NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:keyName ascending:NO];
        NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
        [request setSortDescriptors:sortDescriptors];
    }

    if (predicate != nil){
        [request setPredicate:predicate];
    }

    NSError *error = nil;
    NSMutableArray *mutableFetchResults = [[self.managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
    if (mutableFetchResults == nil) {
        NSLog(@"%@", error);
    }
    return mutableFetchResults;
}

      

        
        
        
      

    

When the table first appears, everything is displayed correctly, I have 4 objects returning from the DB with the titles displayed correctly in each cell.

But whenever I change to a different view and come back, the table has four objects in order, but the value of their title property is nil!

Here is the code for my Landmark class:

@interface Landmark : NSManagedObject
@property (nonatomic, strong) NSString * title;
@end

@implementation Landmark
@dynamic title;
@end

      

        
        
        
      

    

And this is how my table cells are constructed, if it happens from here:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"LandmarkCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    Landmark *landmark = (Landmark *) self.landmarks[(NSUInteger) indexPath.row];
    cell.textLabel.text = landmark.title;

    return cell;
}

      

        
        
        
      

    

Obviously I am doing something wrong here, but I seriously cannot figure out what.