I've just updated to v4.0 and all breadcrumbs for German articles on my website are screwed up now. I am not very pleased about that! I've already migrated all options.
Funnily on English articles breadcrumbs are ok
But on German articles (the actual default language of my blog) no Home and no category link is shown in the breadcrumb.
I'll go back to v3.9.0 again.