PFQueryTableViewController paging problem example:

This is an Xcode project that illustrates a PFQueryTableViewController problem I encounter.

The issue

In my PFQueryTableViewController with paging enabled, I use a query with the following constraint: orderByDescending:@"createdAt"

The issue occurs when loadNextPage is called while new items have been added to the db without having previously refreshed the table; the loaded objects are duplicates.

How to Reproduce

1. Clone the repository and open the Xcode project.
2. Add your Parse application id and client key in ParseStarterProjectAppDelegate.m
3. Run in simulator
4. Create 4 todo objects by touching 4 times the '+' button
5. Refresh the table by pulling down it's header. Two objects should be showing (Object per page is set to 2) plus the "Load More..." cell.
6. Create 2 more objects by touching 2 times the '+' button
7. Clic on the "Load More..." cell
8. Duplicates of already displayed objects should show up, instead of the two next objects initaly created, as I would have expected.

Questions

I would have expected loadNextPage to return the two following objects instead of duplicates, even if new there has been new entries in database between two fetches. Is that a bug?

How can I use loadNextPage with this kind of query, without having to previously refresh the table?