In pdfpdf 5.3.1 duplicated pages overwrites the original page's data it is duplicating.

[kamranbadirov]

I was duplicating a page from reader with copy.deepcopy and adding it to writer with writer.add_page. The duplicated page overwrites the page it is duplicating.
For example, if Page1 has a field Name filled with value John, and you duplicate Page1 and add new values , e.g. Page2 is added "Marvin", Page3 "is added "Adam", then in the generated pdf all the Name fields will be contain Adam - the last duplicated page's value.

Environment

$ python -m platform
macOS-14.7.4-arm64-arm-64bit

$ python -c "import pypdf;print(pypdf._debug_versions)"
pypdf==5.3.1 crypt_provider=('cryptography', '40.0.1'), PIL=9.5.0

Code + PDF

This is a minimal, complete example that shows the issue:

writer_kwargs: WriterKwargs = {'flags': FieldFlag(unlock_flag)}
reader = PdfReader(filename)
writer: PdfWriter = PdfWriter(clone_from=reader)
new_page_fields = data[i]
current_page = writer.add_page(deepcopy(reader.pages[EMPLOYMENT_PAGE_INDEX]))
new_page_writer_kwargs = writer_kwargs.copy()
update_pdf_writer_page(writer, current_page, new_page_fields, new_page_writer_kwargs)

file.pdf

[stefan6419846]

Thanks for the report. Unfortunately, your issue lacks some details:

• The "minimal, complete example" has quite some undefined variables and functions. Please make sure that it can be executed as-is.
• Is this issue new to version 5.3.1 or why do you explicitly mention it in the title?

Apart from this, it has not been directly clear to me that this issue refers to filling a form as this has not been mentioned in the title or the description.