Custom blog page and breadcrumb problem

In my site, I have a section for blog entries.
I followed the advice given by @acub for the creation of a blog template in this support item :
Add blog or custom post list templates to Customizr [How to]

However, when I click on a blog entry (ok only one for the moment), the breadcrumb does not update to give the “path” from this page.

Here is my sites address : zimrah.giddings.fr (note that it is in French)

The blog page is the menu entry Le Projet.
Here, as expected, the breadcrumb gives the correct path :
Accueil » Le Projet

Now, if I click on the blog entry, here is what the breadcrumb gives :
Accueil » Voyage à Lognes
What I am expecting is :
Accueil » Le Projet » Voyage à Lognes

How can I achieve this ?