[Python] PyPDF2 add_blank_page has an unexpected cropping

I am creating a new page with a PdfWriter to put there a scaled version of my original page, but the result has an unexpected cropping at a vertical line which is about 300pt away from the actual right page border

from PyPDF2 import PdfReader, PdfWriter, PageObject

def scale_pages(page1):
scale_page = PageObject.create_blank_page(width=842, height=595) # Landscape A4 size
if page1:
page1.add_transformation([842/595, 0, 0, 842/595, 0, 595-842])
scale_page.merge_page(page1)
return scale_page
def create_new_pdf(input_pdf, output_pdf):
with open(input_pdf, 'rb') as infile:
reader = PdfReader(infile)
num_pages = len(reader.pages)
writer = PdfWriter()

for i in range(0, num_pages, 2):
page1 = reader.pages
new_page = scale_pages(page1)
writer.add_page(new_page)

with open(output_pdf, 'wb') as outfile:
writer.write(outfile)

input_pdf = 'input.pdf'
output_pdf = 'output.pdf'

create_new_pdf(input_pdf, output_pdf)


input page output page

I tried using Transformation() but the result is the same. I'd expect the scaled page occupy all width of the new page (and white space is there!)

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