Answered
MikelKlinkCorrect answer
Participating Frequently
January 2, 2025
You have a PDF with a hybrid form definition, it contains both an AcroForm form definition and a XFA form definition. This is meant to allow XFA aware viewers to display a form based on the (more flexible) XFA definition while XFA non-aware viewers can still display the (native PDF) AcroForm form.
In your case the third party library appears to have filled in the AcroForm field but not the XFA field. As a consequence XFA aware viewers will not show the values but others will.
