title: TYPO3 9 - site definition on subpage
body: <p>i have the following page tree: </p>
  
  <pre><code>root (1)
     Home (2)
       firstpage (3)
       secondpage (4)
  </code></pre>
  
  <p>etc. Home is my startpage, which i made to Root Page in Tab Behavior. </p>
  
  <p>I defined a site for Home [ID:2] (Domain, language etc) but not for root (1). root is my container page for templates - this should become a multi domain setup. </p>
  
  <p>But this setup seems not to work anymore. The site configuration demands a configuration for root [ID 1] and in the frontend I get a "page not found" error. </p>
  
  <p>When i change my setup and define a site configuration for root [ID:1] instead of Home [ID:2] all works as expected. Is this approach with a root page for template inheritance not possible anymore in TYPO3 9? Or do i miss something? </p>
  
  <p>Thanks!</p>