Each update, such as Core and Quality, affects the position, crawling, and indexing of websites by Google’s robots in one way or another.
If Google doesn’t consider a website to be worthy of being shown in search results, then its robots won’t spend time crawling it or indexing its content.
Incomplete indexing is an issue that even high-quality sites can face – experienced SEO specialists know that not all URLs are indexed by Google or crawled by the search engine.
It’s completely normal if around 20% of a website’s pages are not indexed.
Keep working on the website and regularly improve its quality, and Google will recognize that your resource, website, or online store is worthy of being crawled and indexed. It may not happen immediately, but over time and with consistent effort, more and more of your content will get indexed.
