I have the following Word document: 2Lists.docx:

When I convert it to HTML, the lists are merged:
<ol> <li>Li1</li> <li>Li2</li> <li>NewLi1</li> <li>NewLi2</li> </ol>
This is the Word internal structure:

I think the converter should take into account the id of the numbering. Maybe the "org.zwobble.mammoth.internal.styles.ParagraphMatcher.matchesNumbering(Paragraph)" method should also compare these ids.