Have some issues to get thumbnail label

Hi all, I’m trying to extract the text that is below the thumbnail of a page in the thumbnail view. I cannot use bookmarks since this PDF has no bookmarks. I tried with PageLabel but it doesn’t return the right value. Does someone have an idea ? Thanks !
image001.png (74,6 Ko)

@Pascalf

Can you please share the sample PDF for our reference as well? We will test the scenario in our environment and address it accordingly.

Thanks for your reply and your help. I attached the sample file to this message.
CA009-Wiser (1).pdf (8,3 Mo)

@Pascalf

We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): PDFNET-56843

You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.