Sometimes, errors are introduced when Google processes site elements on their side. One SEO professional was concerned about a lot of errors in Google Search Console that began in mid-July.
They found that there was a noindexed error in Google Search Console even though none of the URLs were marked as noindexed.
When they were crawled and showing up in GSC, they were presenting with this error. On subsequent crawls, they would get indexed.
John Mueller’s hunch, without having looked at the pages, was to double-check if there was really a problem with indexing.
Maybe it’s more of a problem on the rendering side.
He explained that Google uses the Chromium flavor of Google Chrome in order to process site elements on their side. If it has to load many page elements such as CSS files and JS files in order to render the page, it’s possible this is producing the intermittent indexing issues that are being described here.
This discourse occurs at approximately the 5:59 mark in the video.