A Joomla article was published through a menu item (single article) but the breadcrumbs when displaying the article only showed “Home” (not clickable). The menu path and article title was missing in the breadcrumbs.
In this case JoomSEF was installed on the site. The solution was to find the SEF URL in JoomSEF (go to “Manage SEF URLs”). The ItemID field was empty.
The problem was solved by entering the menu ID for the menu item displaying the article in the ItemID field, saving and clearing the cache.