The temporary de-indexing likely happened during a routine re-evaluation of your site following recent changes. One possible contributor was using Google Search Console’s “Validate Fix” button on a non-indexable URL, like your RSS feed. While this action doesn’t directly cause de-indexing, it can prompt Google to recheck certain parts of your site structure, which may delay or reset indexing.

Few things to keep in mind:

Be patient with indexing. If your site or subdomain is new and has a relatively small sitemap, it’s normal for indexing to take time. Avoid repeatedly requesting indexing or validating fixes unless something is clearly broken. Google’s systems will pick up your pages naturally within weeks if not in days. 1.

Ignore non-indexable URLs (like RSS feeds).

• If Search Console flags them as “not indexed” or shows warnings, you can safely ignore those messages.
• These URLs are often discovered through navigation links or auto-generated <link> tags.
• Using “Validate Fix” on them won’t harm your site, but it won’t help either – Google simply ignores feeds for search purposes.
• Only validate fixes when you’ve made significant technical updates, such as adjusting robots.txt, removing noindex tags, fixing server errors, or cleaning up duplicate URLs.

If you’ve changed your site structure (for example, from “blog” to “journal”).

• A URL or subdomain migration can temporarily confuse Google’s systems while it processes redirects and re-evaluates canonical URLs. Follow Google’s official site move guide to help the transition go smoothly.

In short: Temporary indexing drops are common when Google is re-evaluating content or when re-validating the pages. So avoid validating non-indexable URLs, let the crawl cycle run naturally. Indexing usually stabilizes on its own within a few weeks.

Finally, yes, it’s hated by many, but Google’s indexing systems are far more sophisticated than those of other search engines. They evaluate numerous signals to decide whether, when, and how a page should be indexed. Even if your “content” is high quality, Google may still compare it against other pages that cover the same topic and determine its relative relevance before deciding to include it in the index. And if your website is personal and your main goal is simply to have your pages indexed, focus on writing simpler titles or over-optimized ones, and be mindful about internal and external links (not too many in a single article/essay).