In your original post, you mentioned that you were trying to flatten the PDF document. We used the below code snippet for flattening and did not notice any issue as images were intact in the output document:
var doc = new Document(dataDir + "MFO-2105 RUATAN ST1-Before.pdf");
doc.Save(dataDir + "Flattened.pdf");
On the other hand, we did notice that the image was absent when converted dynamic XFA to Standard AcroForms. So, an issue as PDFNET-49682 has been logged in our issue tracking system for the sake of correction. We will look into its details and let you know as soon as it is rectified. Please be patient and give us some time.
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We regret to share that the earlier logged issue is not yet resolved. Please note that it was recently logged in free support model and will be investigated and resolved on a first come first serve basis. We will surely inform you a soon as we make some definite progress towards its resolution. Please be patient and spare us some time.