[wp-meta] [Making WordPress.org] #5979: The table of contents is no longer displayed

[Making WordPress.org]

#5979: The table of contents is no longer displayed
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 Reporter:  jdy68    |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  normal   |  Milestone:
Component:  HelpHub  |   Keywords:
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 I'm co-leader of the French WordPress documentation and I've noticed for a
 few weeks that when we publish new translated posts, the posts don't offer
 the table of contents anymore.
 For example:
 https://fr.wordpress.org/support/article/appearance-customize-screen/
 published on October 29, 2021 displays the table of contents but
 https://fr.wordpress.org/support/article/theme-base-sur-des-blocs/
 published on October 31 no longer displays it.
 All posts published after October 31, 2021 no longer show the table of
 contents.
 I observe the same problem for some posts in the English documentation.
 For example: https://wordpress.org/support/article/new-to-wordpress-where-
 to-start/ or https://wordpress.org/support/article/wordpress-features/

 Moreover, as soon as you update a post (older) which displayed the table
 of contents, once the update is done the table of contents is not
 displayed anymore.
 Example: https://fr.wordpress.org/support/article/glossary/ modified today
 December 6, 2021.

 I tried to compare these posts to see what could be a problem, and I don't
 see anything different in the Hn tags.

 Example for h2 and h3 tags:
 in https://fr.wordpress.org/support/article/appearance-customize-screen/

 <!-- wp:heading -->
 <h2 id="basic-use">basic-use</h2>
 <!-- /wp:heading -->
 <!-- wp:heading {"level":3} -->
 <h3 id="how-to-open-the-customization-tool">How to open the customization
 tool</h3>
 <!-- /wp:heading -->

 in https://fr.wordpress.org/support/article/theme-base-sur-des-blocs/

 <!-- wp:heading -->
 <h2 id="what-is-a-block-based-theme">What is a block-based
 theme ?</h2>
 <!-- /wp:heading -->
 <!-- wp:heading {"level":3} -->
 <h3 id="edit-templates-via-dashboard-templates-screen">Editing templates
 via the Dashboard Templates screen</h3>
 <!-- /wp:heading -->

 Finally, the style of the level 3 headings is different depending on
 whether the post displays a table of contents or not.
 If the post doesn’t have a table of contents, the h3 headings are
 capitalized.

 I can provide the source of posts that don’t have a table of contents or
 search for other information if needed.

 With @audrasjb, we think that the problem comes from an incompatibility
 between WP 5.9 and the extension that creates the table of contents.

-- 
Ticket URL: <https://meta.trac.wordpress.org/ticket/5979>
Making WordPress.org <https://meta.trac.wordpress.org/>
Making WordPress.org