docx4j reports differences on unchanged table data - jaxb

Question

I have created a *.docx file with a 2x2 table, each cell containing the text Cell x-y where x=row number and y=column number.
When I pass this document through a simple transformation process, docx4j's Differencer.diff() method reports no differences (i.e. no w:ins or w:del tags).
This is expected and handled cleanly, inspite of the fact that the .docx has the text of the original document broken up like this inside the <w:tc> -> <w:p> tags:
<w:r>
<w:t>Cell</w:t>
</w:r>
<w:r>
<w:t xml:space="preserve"> 1-1</w:t>
</w:r>
and this in the transformed document:
<w:r>
<w:t xml:space="preserve">Cell 1-1</w:t>
</w:r>
However, if I add the text "Table Title" above the table in the document, the contents of the original document (Word's handling, nothing I can do about it) cells merges into one <w:r>:
<w:r>
<w:t>Cell 1-1</w:t>
</w:r>
And the only difference in the transformed document is that xml:space="preserve" is inserted:
<w:r>
<w:t xml:space="preserve">Cell 1-1</w:t>
</w:r>
However, docx4j's Differencer.diff() method now reports that the content of each cell is inserted, and shows the following as the content of each w:tc's w:p in the generated diff document:
<w:ins xmlns:xalan="http://xml.apache.org/xalan" xmlns:pkg="http://schemas.microsoft.com/office/2006/xmlPackage" w:date="2009-03-11T17:57:00Z" w:author="someone" w:id="1">
<w:r>
<w:t xml:space="preserve">Cell 1-1</w:t>
</w:r>
</w:ins>
and shows the content of each cell as deleted, immediately following the closing <w:tbl> tag:
<!--Handling simple deleted w:p-->
<w:p xmlns:xalan="http://xml.apache.org/xalan" xmlns:pkg="http://schemas.microsoft.com/office/2006/xmlPackage">
<w:del w:date="2009-03-11T17:57:00Z" w:author="someone" w:id="5">
<w:r>
<w:delText>Cell 1-1
</w:r>
</w:del>
</w:p>
I know that the Differencer is capable of ignoring the xml:space="preserve" attributes because it does so with the inserted text before the table, so I doubt that's the cause.
Are these table scenarios outside the intended use case for the Differencer? Is it an error in usage / invocation? Bug?
Any guidance is appreciated.