Adding two comments to same text only shows one

[rodrigoq]

Describe the Bug

Adding two comments to the same text object only shows one in Word.

Steps to Reproduce

<?php
require __DIR__ . '/vendor/autoload.php';

$phpWord = new \PhpOffice\PhpWord\PhpWord();
$section = $phpWord->addSection();

$comment1 = new \PhpOffice\PhpWord\Element\Comment('Author', new \DateTime());
$comment1->addText('Comment1');
$phpWord->addComment($comment1);

$comment2 = new \PhpOffice\PhpWord\Element\Comment('Author', new \DateTime());
$comment2->addText('Comment2');
$phpWord->addComment($comment2);

$start = $section->addText('Hello');
$start->setCommentRangeStart($comment1);
$start->setCommentRangeStart($comment2);

$writer = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord);
$writer->save(__DIR__ . '/out.docx');

The generated xml has no id for the first comment and only references the second one, weirdly Word shows the first one.

comments.xml

<w:comment w:id="" w:author="Author" w:date="2021-06-28T12:51:44-03:00">
<w:p>
  <w:pPr/>
  <w:r>
   <w:rPr/>
   <w:t xml:space="preserve">Comment1</w:t>
  </w:r>
</w:p>
</w:comment>
<w:comment w:id="2f939d" w:author="Author" w:date="2021-06-28T12:51:44-03:00">
<w:p>
 <w:pPr/>
 <w:r>
  <w:rPr/>
  <w:t xml:space="preserve">Comment2</w:t>
 </w:r>
</w:p>
</w:comment>
</w:comments>

document.xml

<w:p>
 <w:pPr/>
 <w:commentRangeStart w:id="2f939d"/>
 <w:r>
  <w:rPr/>
  <w:t xml:space="preserve">Hola</w:t>
 </w:r>
 <w:commentRangeEnd w:id="2f939d"/>
 <w:r>
  <w:commentReference w:id="2f939d"/>
 </w:r>
</w:p>

Expected Behavior

Show both comments.

Something like this on document.xml

<w:p>
 <w:pPr/>
 <w:commentRangeStart w:id="[id comment1]"/>
 <w:commentRangeStart w:id="[id comment2]"/>
 <w:r>
  <w:rPr/>
  <w:t xml:space="preserve">Hola</w:t>
 </w:r>
 <w:commentRangeEnd w:id="[id comment1]"/>
 <w:r>
  <w:commentReference w:id="[[id comment1]"/>
 </w:r>
 <w:commentRangeEnd w:id="[id comment2]"/>
 <w:r>
  <w:commentReference w:id="[[id comment2]"/>
 </w:r>
</w:p>

Current Behavior

Shows only one comment (Comment1).

Context

• PHP Version: 7.3.22
• PHPWord Version: 0.18.2 and current last dev branch.