There were lots of unconfirmed cases of indexing issues around URLs, which was resulting in the dropping of Google Indexing. Google confirmed the issue and said that it was not only a canonicalization.ion issue but also a mobile-indexing issue.

Recommendation – Google Again Faced News Content Indexing Issue

Google Confirmed:

We are currently working to resolve two separate indexing issues that have impacted some URLs. One is with mobile-indexing. The other is with canonicalization, how we detect and handle duplicate content. In either of these two cases, pages might not be indexed.

Mobile Indexing

If a previously indexed page has gone, it might be the mobile-indexing issue, where we’re failing to select any page at all to index. If the canonical issue is involved, URL Inspector may show the URL as a duplicate & the Google-selected canonical will be different from it

Canonicalization issue

If the canonical issue is involved, URL Inspector may show the URL as a duplicate & the Google-selected canonical will be different from it.

Google Fixing The Issue

Google assured the site owners that they are working on fixing the issue and the site owners don’t have to take steps on the issue.

As Said By Google:

There’s no action to take with these issues on the part of site owners. We apologize for the issues here and are working rapidly to resolve them. We’ll update this thread as each is corrected.

We are currently working to resolve two separate indexing issues that have impacted some URLs. One is with mobile-indexing. The other is with canonicalization, how we detect and handle duplicate content. In either case, pages might not be indexed….

— Google SearchLiaison (@searchliaison) October 1, 2020

If a previously indexed page has gone, it might be the mobile-indexing issue, where we’re failing to select any page at all to index. If the canonical issue is involved, URL Inspector may show the URL as a duplicate & the Google-selected canonical will be different from it….

— Google SearchLiaison (@searchliaison) October 1, 2020