Google noted that if the HTTP status code is non-200 (for example, on error pages with 404 status code), rendering might be skipped.
Google added a section on canonicalization best practices for JavaScript to the JavaScript SEO best practices document.
The problem is that the Google app–powered search tool misses out on some of the Pixel Launcher’s most useful features, ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results