When two PDFs containing AcroForm fields are merged with PdfStreamWriter, the generated PDF contains page widget annotations whose parent field dictionaries are not correctly registered in the document-level /AcroForm/Fields tree.

The issue is reproducible by merging the same four-page form twice. The resulting PDF contains all widget annotations, but PDF viewers do not resolve the second form’s interactive fields correctly.

Calculation chain construction during import takes a lot of time for documents with formulas with large area references.

Calculation of array formulas with large area references takes a lot of time.

Missing table row content due to incorrect measurements after PDF export of a specific document.

InvalidDataException is thrown when importing an XLS document with malformed compressed picture data in the drawing layer.