Thanks for sharing the details.
Aspose.Pdf.Facades is an older approach and sooner or later, it is going to be obsolete so we are recommending customers to try migrating to new DOM approach. Therefore in one of the replies shared earlier by Asad and in my recent post, I have shared the approach of new DOM model.
Furthermore, from your original problem description, we do understand that PdfAnnotationEditor and Aspose.Pdf.Facades.Form are causing issues with 738676.pdf document but the same code snippet works with other documents. So it appears to be an issue related to this specific document. For the sake of correction, I have logged it as PDFNET-42974 in our issue tracking system. We will further look into the details of this problem and will keep you updated on the status of correction.
The reason same Facades approach was suggested to other customer is because it was fulling his requirement. Whereas in your case, the Facades approach is causing issues and migration to new DOM approach solves the problem and that is why we recommended you to please try using DOM approach.
As explained earlier, Aspose.Pdf.Facades is an older approach and it may be discontinued in near future (we are not certain about the dates) so we are encouraging customers to use new DOM. The reason documentation related to Aspose.Pdf.Facades is still present is because many of the customers are still using Facades and from time to time, they do consult it. Removal of documentation may cause trouble for them.
Should you have any related query, please feel free to contact. We are sorry for this inconvenience.