Modern: isLoading() is always true in PaginationContainer render method after loadMore()

I was looking for a way to display a loading indicator in a PaginationContainer after calling `loadMore()` and I thought `this.props.relay.isLoading()` might do the trick. However, I see that the PaginationContainer's `render()` method is called only once after the network request (which I guess is expected), but `isLoading()` is always `true`. This seems like a bug since presumably the network request has completed prior to the refresh and therefore `isLoading()` should return `false`.

As an aside, this still leaves me with the question of how to display a loading indicator during paging in additional data via `loadMore()`.