PDF export bug: ordered lists in textboxes

[tw77]

Description

In a book set to McLuhan, list items in an ordered list within a textbox appear correctly in the webbook, but incorrectly in PDF exports.

When we export a PDF with an ordered list within a textbox, list items after the first one have their corresponding number placed on one line, followed by a dot on a second line, followed by their content on that second line.

In an ordered list with nested items, only the top-level list items are affected:

This only occurs in PDF exports and does not occur with ordered lists outside of textboxes.

PDF exports of books set to Malala don't appear to have this issue.

The issue is also not apparent from the XHTML source, only the exported PDF file.

Steps to Reproduce

1. Set a book to McLuhan.
2. Create a textbox in a chapter.
3. In the textbox, add an <ol> with multiple items.
4. Save the chapter.
5. View the chapter in the webbook. It should display normally.
6. Export the chapter in a PDF.

Expected behavior: The list displays correctly in the PDF, as it does in the webbook chapter.

Actual behavior: The numbering of list items is formatted strangely from the second (top-level) list item on.

[MichSpieler]

tried to reproduce it with a book from scratch: https://university.pressbooks.pub/sandboxjune2024/
I was unable to reproduce the issue.

[tw77]

For reference, my test chapter https://staging.pressbooks.network/textboxtest/wp-admin/post.php?post=30&action=edit