PDF export fails when a page has a lot of text.

Currently, on a clean instance, PDF export does not work correctly if the document contains a lot of text.

1. Create a new XWiki instance
2. Increase the PDF export timeout and set the size limit to 0 to ensure they do not affect the output
3. Go to a Sandbox page
4. Add the content from the attached file to the page
5. Export the page as PDF and wait for the process to complete

Expected result:
The entire document is exported.
Actual Result:
Only a section of the document is exported.