Canonicalization issues are among the core challenges of technical SEO, especially when dealing with large content websites, indexes, and complex publisher sites. We define the preferred URL in the code, but Google, as we know, often decides otherwise and selects a different canonical URL than the one we intended.
On July 10, 2026, Google published an important update to its documentation, explaining exactly how long it takes for the algorithm to “digest” canonicalization fixes and why duplicate content may remain clustered together for much longer than expected.
The New Time Frame: Google’s “Two-Week Rule”
The most significant update concerns the waiting period. According to the new addition to Google’s documentation, even after you identify and address a duplicate content issue, Google may continue to keep the pages together in the same duplicate cluster for up to two weeks.
For SEO professionals, this means that patience is required. Changing a canonical tag or making a minor text update will not immediately result in the URLs being separated in the index.
How Can You Speed Up the Unclustering Process?
Google’s message is clear: you cannot rely solely on a technical signal in the code. Google explains that the algorithm clusters URLs when the “Primary content” appears very similar. To speed up a page’s exit from the cluster, the difference in content between the pages must be clear and significant. Only a genuine and substantial change to the content will cause the algorithm to separate the URLs more quickly.
Once the necessary content changes have been made, it is recommended to use the Request Indexing tool in Search Console to signal to Google that the pages should be crawled again. However, since this tool is subject to crawl quotas, Google recommends not “overdoing it” by manually submitting URLs on a massive scale.
Why Does Google Sometimes Ignore the Canonical Tag?
Before rushing to fix the canonical tag, Google recommends checking the URL Inspection tool to determine whether the URL selected by the algorithm may actually serve users better than the URL you specified. If there is still an issue, these are the most common reasons why Google ignores your canonical:
- Missing Hreflang Tags: If you have multiple websites or subdomains displaying identical content to different audiences around the world without properly implementing Hreflang tags (for example, a US version and a UK version), Google may have difficulty understanding the local context and identify the pages as duplicate content.
- CMS Errors and Server Misconfigurations: Problematic plugins that generate incorrect
rel="canonical"tags or unexpected redirects. In addition, servers that return content from one domain in response to a request for another domain, or generate identical Soft 404 pages that the algorithm does not recognize as error pages. - Content Syndication: A particularly critical issue for news websites, media sites, and portals. Google recommends not using a canonical tag to address duplicate content with content partners who republish your articles. The correct solution (as also described in the Google News guidelines) is to require partners to completely block the syndicated content from being indexed by search engines.
- Hacked Websites and Copycats: Hackers who insert malicious cross-domain redirects or canonical tags into your website’s code can cause Google to index their spam URL instead of yours. In the case of external websites that simply steal your content, you can and should submit a content removal request (DMCA) to Google.
In Conclusion
Google’s update reinforces what we in the technical SEO team always emphasize when conducting complex audits – canonicalization is not merely a matter of a tag in the code, but rather of content architecture and genuine differentiation.
Do not settle for a technical “band-aid”; make sure your pages are unique enough, use Search Console tools wisely, and keep in mind that solving the root causes of indexing issues now requires a realistic time frame of up to two weeks.
