The markup of the WCAG 3.0 document

Is there any reason that the section numbering is not included in the
heading? For example, Aid navigation is actually a section of 2.1, but it
is not included in the heading and only available on the   Permalink.

<div class="header-wrapper" bis_skin_checked="1"><h3
id="x2-1-aid-navigation">Aid navigation</h3><a class="self-link"
href="#aid-navigation" aria-label="Permalink for Section 2.1"
bis_skin_checked="1"></a>

<button class="status-filter sticky" title="We will be addressing this
topic." type="button">Placeholder</button></div>