I was trying to check the differences between a class implemented in Drupal 11 and the same class implemented in Drupal 10, to backport code, when I noticed that the documentation page for that class does not show any link for other Drupal versions.
That happens for ConfigEntityBase, for example, but also for EntityBase, and functions like user_role_grant_permissions().
(I took the screenshot from an InPrivate window, but the same happens in normal browser windows.)
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It's likely this issue predates Contrib.social: some issue and comment data are missing.