There are redundant sets of items in the aural interface

Overview

If you open up the rotor in VoiceOver you will notice within the Lists, Links, Images, Headings, and Landmarks sections a duplicate set of items for the current theme displayed on the canvas page. In the Byte theme with Drupal CMS 2.x:

Or in Olivero with Drupal CMS 2.x:

While within the Form Controls, Window Spots, and Buttons sections there is no duplicate set and the items are only listed once. When searching the DOM in the browser for items listed in the rotor in VoiceOver the first match is within the iframe element the second match in the #document within that iframe. In addition to that the number of landmarks in VoiceOver is getting expanded after a few seconds the landmark rotor is active (see landmarks.mp4).

Discussed and worked on the issue with @itmaybejj and @the_g_bomb

Proposed resolution

Ensure that elements in the default theme are only available once to the aural interface for a canvas page

User interface changes