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target property with `:root > div > img` value

See original GitHub issue

Product: axe-core v4.3.2

Expectation: to return a target with which doing document.querySelector(target[0]); to return an html element.

Actual: it returns a target with which doing document.querySelector(target[0]); results with null.

website example: https://kenzdesigns.com.au/ code snippet:

<!doctype html>
    <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>Document Title</title>
    </head>
    <body>
    <div class="line1">Ethnicraft OLD SADDLE range&nbsp;</div>
    <div class="inner-div">
      <div class="col-xs-6 cat_pro_item">
        <a href="3 Seater">
          <div><img src="https://www.kenzdesigns.com.au/image/cache/catalog/Ethnicraft/20084-N701-3-seater-old-saddle-MAIN-145x200.jpg" class="img-responsive"></div>
        </a>
      </div>
      <div class="col-xs-6 cat_pro_item">
        <a href="1 Seater">
          <div><img src="https://www.kenzdesigns.com.au/image/cache/catalog/Ethnicraft/20082-N701-1-seater-old-saddle-main-145x200.jpg" class="img-responsive"></div>
        </a>
      </div>
      <div class="col-xs-6 cat_pro_item">
        <a href="Corner">
          <div><img src="https://www.kenzdesigns.com.au/image/cache/catalog/Ethnicraft/20080-N701-corner-sofa-old-saddle-145x200.jpg" class="img-responsive"></div>
        </a>
      </div>
      <div class="col-xs-6 cat_pro_item">
        <a href="Ottoman">
          <div><img src="https://www.kenzdesigns.com.au/image/cache/catalog/Ethnicraft/20081-N701-footstool-old-saddle-main-1-145x200.jpg" class="img-responsive"></div>
        </a>
      </div>
    </div>
    </body>
    </html>

when on this snippet I am doing axe.run(document, { runOnly: ['image-alt'] }); it returns

{
  violations: [
    {
      id: "image-alt",
      nodes: [
        {
          html: '<img src="https://www.kenzdesigns.com.au/image/cache/catalog/Ethnicraft/20084-N701-3-seater-old-saddle-MAIN-145x200.jpg" class="img-responsive">',
          target: [':root > div > img']
        }
      ]
    }
  ]
}

which then doing document.querySelector(':root > div > img') it returns null.

I am trying to understand if this is expected behaviour or a bug?