Problem with table rowspan and colspan formating in pdf

Hi, all.
I have problem with creating *.pdf file for table with rowspan and colspan.

In Html browser formating is:

In *.pdf formating is:

Table formating for text 3, text 4, text 6 is not correct.

Code is:

Is any workaround?

Start by reproducing the table example from the issue's linked code and compare the browser screenshots with the generated PDF, focusing on cells using rowspan and colspan. The issue provides no repository file or test entry point; done means text 3, 4, and 6 are laid out correctly in the PDF as well as in the browser.

索引モデルが issue の本文から書いたものです。