It seems SEO Checker reports an error "Multiple SEO Title tags title-tag are found, a page can only have one." when using title-tag inside an svg-tag element and having title-tag in head-tag too.

It should be valid to use title-tag inside svg-tag like this: https://developer.mozilla.org/en-US/docs/Web/SVG/Element/title

In my case it complains about this and before title-tag also exists in head-tag. If I uncomment title-tag in svg-tag element, SEO Checker doesn't report the error:

<figure class="logo">
  <a href="/">
    <svg class="svg-logo">
      <title>@siteNode.GetPropertyValue("siteName")</title>
      <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="/dist/icons/icons.svg#logo"></use>
    </svg>
  </a>
 </figure>

I think SEO Checker only should validate against title-tag inside head-tag.

/Bjarne