Hello,
MS Word doesn't have a tag for lists. Lists are paragraphs but with an special numbering style; so when you add a list, the conversion from HTML to MS Word included in phpdocx generates a paragraph for each list item (but there's no root element that wraps all items of the list, as each item has its own w:p tag and a numbering style).
UPDATE: https://www.phpdocx.com/documentation/snippets/prevent-break-table-HTML
Regards.