Navigation items from tabs aren't picked up

Issue Summary

When you go to, for example:

Home › Administer › Content management › Content types

and select "Add content type" tab the Breadcrumb turns into:

Home › Administer › Content management › Content types › Content types

The last crumb duplicates its content from the previous crumb when a tab is selected (not the first tab usually).

Expected behaviour: When a tab is selected the last crumb should use the tab link text.

When the first of the tabs is active by default (I think that's usually the case, I'm not sure if it's always like that) Drupal doesn't change the link of the page, and it makes sense not to change the breadcrumb in that case eather.