The Google Webmasters team reported on Twitter that another bug was found in the search.
This error causes Google bot to choose irrelevant canonical URLs. As a result, irrelevant links may appear on mobile crumbs on mobile devices. In rare cases, this bug may cause problems with indexing.
Google engineers are currently working on fixing the error and will report when this issue is fully resolved.
We’re aware for some pages, there’s an issue where we may have selected an unrelated canonical...