[wp-trac] [WordPress Trac] #51136: Third-party sitemap plugin returning 404 after disabling core's sitemap

[WordPress Trac]

#51136: Third-party sitemap plugin returning 404 after disabling core's sitemap
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 Reporter:  vaurdan       |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Sitemaps      |     Version:  5.5
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by vaurdan):

 @pbiron I was able to reproduce it in a fresh WordPress install, but with
 a caveat: I had to use WordPress 4.4.2 initially.

 Here are the steps:

  1. Install WP 4.4.2 (pre-sitemap)
  2. Install msm-sitemap (use the [https://github.com/Automattic/msm-
 sitemap Git version (master)], as the plugin in the Repo still doesn't
 disable core sitemaps with the filter) and generate a sitemap
  3. example.com/sitemap.xml will return 200
  4. Update 4.4.2 to 5.5
  5. example.com/sitemap.xml will return 404
  6. flush rewrite rules ( Settings > Permalink > Save )
  7. example.com/sitemap.xml is still returning 404
  8. apply the patch or the workaround, and it now returns 200.

 I believe that the order of registering the rewrite rules (msm-sitemaps
 registers before core sitemaps even exists) are a factor on this issue.

 Let me know if you are able to reproduce using these steps.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51136#comment:4>
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