Adding Tabindex Value to HTML5 Vaguely Semantic Element adds it to the Landmarks and Form Controls lists in VoiceOver Rotor

voiceover-tabindex-landmarks.html

<main>
  <section>
    <h2>This will not appear in the Rotor under Landmarks or Form Controls</h2>
    <p>This is the expected behavior.</p>
  </section>
  
  <article>
    <h2>This article will not appear in the Rotor under Landmarks or Form Controls</h2>
    <p>I'm surprised that it appears under Landmarks when you add a tabindex value. It happens for values of 0 or -1, and likely for other values too.</p>
  </article>
  
  <section tabindex="0">
    <h2>This will appear in the Rotor under Landmarks or Form Controls</h2>
    <p>I'm surprised that it appears under Landmarks when you add a tabindex value. It happens for values of 0 or -1, and likely for other values too.</p>
  </section>
  
  <article tabindex="-1">
    <h2>This article will appear in the Rotor under Landmarks or Form Controls</h2>
    <p>I'm surprised that it appears under Landmarks when you add a tabindex value. It happens for values of 0 or -1, and likely for other values too.</p>
  </article>

</main>