Display a page range possibly not working correctly

[arjen375]

I am trying to get the PdfRangeDocument.FromDocument method to work on a Windows Form but whatever I try, it will always show me a page range [1..n] rather than [m..m+n]. If Ι am using the following:

    private void pdfViewer1_Load(object sender, EventArgs e)
    {
        string path = @"D:\tmp\0543_y20_sp_4.pdf";
        IPdfDocument _document = PdfDocument.Load(path);
        pdfViewer1.Document = PdfRangeDocument.FromDocument(_document, 2, 2);
    }

I expect this to show page 2 of the pdf but is just shows page 1. If I change the last line to

   pdfViewer1.Document = PdfRangeDocument.FromDocument(_document, 2, 3);

I get pages 1 and 2 displayed.

Am I missing something here?