Table footer appears as header after converting to new editor

Issue Summary

Table footer appears as header after converting to new editor

This is reproducible on Data Center: N/A

Steps to Reproduce

1. Create a Confluence legacy page editor with content

   <h2>Table</h2>
   <table class="wrapped"><colgroup> <col /> <col /><col /> </colgroup>
   <thead>
   <tr>
   <th>Table heading</th>
   <th>Table heading</th>
   <th colspan="1">Table heading</th></tr>
   </thead>
   <tfoot>
   <tr>
   <th>Table footer</th>
   <th>Table footer</th>
   <th colspan="1">Table footer</th></tr>
   </tfoot>
   <tbody>
   <tr>
   <td>Table data</td>
   <td style="text-align: center;">Table data</td>
   <td style="text-align: right;" colspan="1">Table data</td></tr>
   <tr>
   <td>Table data</td>
   <td style="text-align: center;">Table data</td>
   <td style="text-align: right;" colspan="1">Table data</td></tr>
   <tr>
   <td>Table data</td>
   <td style="text-align: center;">Table data</td>
   <td style="text-align: right;" colspan="1">Table data</td></tr>
   <tr>
   <td>Table data</td>
   <td style="text-align: center;">Table data</td>
   <td style="text-align: right;" colspan="1">Table data</td></tr></tbody></table>
   <p><br /></p>
   

   Note the <tfoot> with <th> children.

2. Convert the page to the new editor

This scenario can happen when migrating from Confluence Server, as all pages use the legacy editor by default.

Expected Results

Table footer remains table footer

Actual Results

Footer appears in header section, in this case, it is the second row of the table. This is also visible in the preview.

Workaround

Currently, there is no known workaround for this behavior. Manually edit the table if required.