See attached sample project with problematic pdf:
We have downloaded the shared file from the link and have edited your post to remove the link because it contained the license file. Please never share your license publicly. We will soon let you know about the issue after testing the scenario in a while.
We have replicated the issue in our environment and have logged it as PDFNET-51825 in our issue tracking system. We will further look into its details and keep you posted with the status of its rectification. Please be patient and spare us some time.
We are sorry for the inconvenience.