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Soft 404 bug has returned?
Hi all, starting to think that the Soft 404 bug reported in April has returned.
Since the start of June we had a slight uptick in soft 404s being reported, in recent days this has significantly spiked. We saw this larger uptick start from the 6th of June 2021 and then roughly every 3 to 4 days at ~2-3 thousand URLs. This has resulted in pages previously ranked #1, #2 for particular keywords being completely removed from Google.

Now this is where it’s strange. The example URLs provided are so widespread, there’s no consistency in the type of page that would help us identify the root cause.

We’ve kicked off a validation process to see if this would self correct but after 4 days the process is still running. While I’ve seen long running validation processes before this seems to be a new winner (2nd of July in Aus).

Diagnosing the problem
If anyone has suggestions on this it’d be greatly appreciated. What we’ve ran through so far:
- Reviewing access logs to see if Google can correctly crawl the site. No problem here, logs are consistent with periods of non soft 404 reporting.
- Checked server performance for the month ensuring no outages or odd behaviour relates to dates. Found everything was operational.
- Compared response length/size to ensure HTML isn’t malformed.
- Reviewed releases over the past ~30 days. Very basic releases have been done and many of these changes were specific to certain pages and not wide spread. Nothing that would be considered an “SEO” change in my books.
- Made use of Structured data, Rich results and Web Friendly tools to see if they could correctly access the reported URLs. All had no problems, screenshots from Web Friendly tool looked ok, nothing changed from the “Page partially loaded” issues reported, these have existed since inception.
- Reviewed third party additions - This includes ads. This was done to ensure there wasn’t any “transient failure” occurring. Something that may block the loading of pages. While JS errors exist (always do especially with ads) none are render blocking.
- Check pages have referring links and can be accessed by multiple avenues (as a user would). Menus, breadcrumbs, indexes all provide links. URL Inspection tool also confirms this.
- Spam algorithm changes - reviewed information reported on this change and the definitions of spam. The page contents are very much unique across the site, data, images, layouts.
Inconsistency within Search Console
We’ve seen mixed results when using the URL Inspection tool. Different results appear for different people and times.
Example of same day results, different people.
(Had to upload images due to limit of 3 per post)
Some of the many URLs that have been hit:
Thoughts?
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