Clean pagination doesn't work on pages with a url alias

I have created a simple test node of type Page with a long content in the body field, and use Paging module to paginate it. Now, if I add the the path to that page which is the following:

to the Clean Pagination module settings, nothing happens. However, if I add the node equivalent path which is:

to the Clean Pagination module settings, then as long as I access the node using this path, it works. But if I access using the earlier path, then clean pagination doesn't work. Does anyone know why, or the solution to this?

Thanks,
James