WordPress Sitemap Audit After a Plugin Update: What to Check and Fix
Plugin updates are the most common trigger for WordPress sitemap regressions. An update to Yoast SEO, Rank Math, or All in One SEO can change sitemap URL structures, reset content type inclusion settings, alter how the plugin interacts with WordPress caching, or introduce bugs that temporarily break the sitemap entirely. Most of the time nobody notices until GSC starts reporting errors weeks later.
This guide covers the specific post-update issues you need to check after updating any major WordPress SEO plugin — with diagnostic steps and fixes for each.
Issue 1: Sitemap URL Changes After an Update
Sitemap URL changes happen when a plugin update restructures how sitemaps are generated. Yoast SEO, for example, changed its sitemap URL pattern multiple times across major versions. In older versions it used /sitemap_index.xml. In some configurations it outputs /wp-sitemap.xml (which is actually the WordPress core sitemap, not Yoast's). All in One SEO switched from /sitemap.xml to /sitemap_index.xml in version 4.x.
How to diagnose: After any plugin update, immediately check whether the URL you have submitted to GSC still returns your sitemap. Also check whether a new sitemap has appeared at a different URL. Visit /sitemap.xml, /sitemap_index.xml, and /wp-sitemap.xml — all three — to understand what is being served and from where.
Fix: If the URL changed, update your robots.txt Sitemap: directive and resubmit in GSC using the new URL. If both the old and new URL are returning sitemaps (which happens when both the plugin sitemap and WordPress core sitemap are active simultaneously), disable the WordPress core sitemap to avoid duplicate sitemap confusion. In WordPress core, add remove_action( 'init', 'wp_sitemaps_register' ); to functions.php or use the plugin's setting to disable core sitemaps.
Issue 2: New Post Types or Taxonomies Suddenly Included or Excluded
SEO plugin updates sometimes reset or change the defaults for which post types and taxonomies are included in the sitemap. A Rank Math update in late 2023 changed the default behavior for custom post types registered by third-party plugins — many users found that post types that had been correctly excluded (e.g., WooCommerce product variations, ACF option pages, custom popup post types) were suddenly included, bloating the sitemap with hundreds or thousands of non-indexable URLs.
The reverse also happens: a plugin update resets a custom post type to excluded when you had intentionally included it. If you have a custom post type like services or case-studies that should be in your sitemap, verify it is still there after every plugin update.
How to diagnose: Compare the URL count in your sitemap before and after the update. A significant increase (more than 10–15%) or decrease (more than 5%) warrants investigation. In Yoast, check Settings → Appearance → Content Types. In Rank Math, check Sitemap → General Sitemap. In All in One SEO, check Sitemaps → General Sitemap.
Fix: Restore your intended inclusion/exclusion settings manually. Document these settings — screenshot or export your configuration — before every major plugin update so you have a baseline to compare against.
Issue 3: Noindex Settings Reset, Exposing Previously Hidden Pages
Individual page-level noindex settings are stored in WordPress post meta, so they are generally preserved across plugin updates. However, global noindex settings — applied at the post type or taxonomy level — are stored in the plugin's own options table and can be reset to defaults during a major version update.
The dangerous scenario: you have tag archives set to noindex globally in Yoast (correct, since tag archives are typically thin content). After a Yoast major version update, the global setting reverts to "index." Your sitemap now includes tag archive URLs, and those pages are suddenly indexable. If Google crawls them before you notice, they may be indexed as thin content pages, which can dilute your site's quality signals.
How to diagnose: After a plugin update, check your global noindex settings for: tag archives, category archives (if you use these deliberately), author archives, date archives, and search result pages. In Yoast: Search Appearance → Taxonomies and Archives. In Rank Math: Titles and Meta → Tags, Categories, etc.
Fix: Restore intentional noindex settings immediately. If GSC has already crawled the newly-indexable pages, resubmit the sitemap and request indexing on the pages you want indexed, and ensure the noindex pages are correctly excluded from the sitemap to prevent crawl budget waste.
Issue 4: Sitemap Size Limits Hit After New Content Is Included
If a plugin update suddenly includes a previously excluded post type that has thousands of entries (product variations, attachment pages, ACF flexible content blocks registered as post types), your sitemap can exceed the 50,000 URL limit. When this happens, most plugins silently truncate — the sitemap is generated but stops at 50,000 URLs, dropping the rest without any error.
How to diagnose: Count the URLs in your sitemap. If any child sitemap returns exactly 50,000 URLs, it is hitting the limit and truncating. GSC will also show a discrepancy between "Submitted" and "Indexed" counts that can signal truncation.
Fix: First, verify that the newly included post type should actually be in the sitemap. If not, exclude it. If the content genuinely needs to be in the sitemap, move to a sitemap index structure and configure the plugin to split sitemaps by post type. In Yoast, this is handled automatically. In Rank Math, you may need to configure per-sitemap URL limits. Also check your server's caching layer — some caching plugins cache a truncated sitemap and continue serving it even after the underlying data changes.
Issue 5: Redirect Chains Introduced by Plugin URL Changes
When a plugin update changes the sitemap URL (e.g., from /sitemap.xml to /sitemap_index.xml), some plugins or hosting configurations automatically add a redirect from the old URL to the new one. This means Googlebot fetching your old GSC-submitted sitemap URL gets redirected to the new location. That is survivable, but it creates a redirect chain if additional redirects are already in place — for example, HTTP → HTTPS → new sitemap URL.
More problematic: some redirect managers (like Redirection plugin or server-level rules) cache the old URL and redirect it to a non-sitemap destination entirely, causing a 404 or a homepage redirect.
Fix: After any plugin update that changes sitemap URLs, trace the full redirect chain using curl: curl -I -L https://example.com/sitemap.xml. The final response should be a 200 at the correct sitemap URL. If you see more than one redirect hop, update your GSC submission and robots.txt to point directly to the final URL and remove any intermediate redirects.
The Post-Update Audit Checklist
Run this sequence immediately after updating any WordPress SEO plugin:
- Fetch your sitemap index URL directly and confirm it returns HTTP 200 with valid XML content.
- Compare total URL count to your pre-update baseline. Investigate any change greater than 10%.
- Check that the sitemap URL in your robots.txt matches the actual current sitemap URL.
- Verify global noindex settings for archives and taxonomies have not been reset.
- Spot-check 10 random URLs from the sitemap — confirm they return 200, have correct canonicals, and do not have noindex tags.
- Check GSC for any new sitemap errors within 48 hours of the update.
- If the sitemap URL changed, update GSC submission and verify the new submission resolves without errors.
This audit takes about 20 minutes if you have a process for it. Without a process, it typically takes weeks to discover a problem — by which time Google has already crawled and cached the erroneous sitemap state. Treat plugin updates the same way you treat code deployments: verify before and after.