Steps to reproduce the issue

Add inside an article while in scource code view the following:
<details class="accordion-item">
<summary class="accordion-button collapsed"><h3>My Heading</h3></summary>
<p class="accordion-body">Lorem impsum...</p>
</details>

Expected result

...would be to keep all code unchanged, especially when one can use heading elements inside <summary> as explained her:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/summary#summaries_as_headings

Actual result

<details class="accordion-item">
<h3>My Heading</h3>
<p class="accordion-body">Lorem impsum...</p>
</details>

System information (as much as possible)

J! 4.2.9
PHP 8.1.17

Additional comments

none