sergey-import weird issue

[griffi-gh]

<sergey-import src="news-item" /> works but <sergey-import src="news-item"></sergey-import> dosn't

<sergey-import src="template">
  <sergey-template name="page">news</sergey-template>
  <sergey-template name="title">Новости</sergey-template>
  <sergey-template name="main">
    Main content goes here!
    <sergey-import src="news-item">
    </sergey-import>
    More content
  </sergey-template>
</sergey-import

[griffi-gh]

<sergey-import src="news-item"></sergey-import> just makes the main slot fall back to default content