section element and p tag regressions

Problem/Motivation

First reported regression (section element):

 <section> tag gets removed and  gets pushed down out of the table tag.

CKEDITOR 5 markup input

<div>
 <section>
     <table><tr><td>test</td></tr></table>
 </section>
<div>

CKEDITOR 5 markup output (incorrect/unexpected)

<p>
    test tests
</p>
<table>
    <tbody>
        <tr>
            <td>
                test
            </td>
        </tr>
    </tbody>
</table>
<div>
    <div>
        &nbsp;
    </div>
</div>

Second regression reported: p tag added

CKEDITOR 5 markup input

<table>
  <tr>
    <th>xyz</th>
  </tr>
</table>

CKEDITOR 5 markup output (incorrect/unexpected)

<table>
<th><p>xyz</p></th>
</table>

Third regression reported: caption element vanishes.

<caption class="text-left">Priority Area Performance Measures – Table A</caption>
is changed to
Priority Area Performance Measures – Table A, that is the <caption class="text-left"> is removed by CKEditor.

Steps to reproduce

Install and configure this module

Proposed resolution

See patch or upgrade once committed

Remaining tasks

Review patch/upgrade

User interface changes

Just fixes

API changes

See code changes

Data model changes

None