As discussed in !56 (merged) , the fact that getCompactTitle displays short_title or reference or title introduced a change in the value displayed in breadcrumb.
We concluded that using getCompactTranslatedTitle on breadcrumb was still the best choice and that getCompactTitle should not display reference before title.
At the same time, this merge request includes changes to Person.getTitle so that getTitle & getCompactTitle behaves consistently on persons documents as well.