We were able to replicate the issue in our environment using your shared PDF document. Therefore, we have logged an issue as PDFNET-45591 in our issue tracking system for the sake of detailed investigation. We will look in details of the issue and keep you informed with the status of its resolution. Please be patient and spare us little time.
I am afraid that earlier logged issue is not yet resolved due to other pending issues in the queue. The issue was logged under normal support and it has low priority unlike priority support model where issues are resolved on urgent basis. As soon as we have some definite updates regarding resolution of the issue, we will surely let you know. Please spare us little time.
Regretfully, the issue could not get resolved yet. We will surely post an update in this thread as soon as some significant progress is made towards ticket resolution. Please give us some time.