[3073] Google crawler parses empty DOM with SSR

Logic below explained: If user agent is a crawler/bot (e.g. google), then render the page with SSR.

  serverMiddleware: [{
    handler(req, res, next) {
      let isBot = crawlersRegex.test(req.headers['user-agent'])
      res.spa = !isBot
      next()
    }
  }]

Using the fetch as google: https://www.google.com/webmasters/tools/googlebot-fetch

I get this strange result:

Obviously the content is empty. That was when loading indicator is disabled.

If loading indicator is enabled, then the loading indicator will be there:

Other:

• Google uses Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) User Agent. If I fake it in my chrome, I get correctly a SSR rendering.
• Curl returns the correct DOM structure if a bot agent (like the above) is used
• Google result looks like they get a CSR rendering
• Facebook, twitter etc parse the content also correctly (e.g. from the open graph meta). This issue happens only with google crawler.

Assumptions:

• If no one else is affected from this but me, then the conditional rendering above might be an issue
• If Nuxt returns basic initial html and the Google crawler is programmed to stop when there is some html (even before the server has not completed) this might also be a reason

Update:

• If I force set res.spa = false in every request, google will render the results correctly. Therefore something is happening with the conditional rendering