WRoom : TCK templates import english / french page titles are missing

Create a site using the prepackage TCK templates.

At the end of the import (no error in my console during import)
1/ There is only one subpage visible in the menu (but in fact there are more than one page at that depth.
2/ I had "no title" for all my english pages and some of my french pages, in german it was ok all page titles where present.

I've edited the menu to type the translations, the three first items where empty in english, but the the forth and above where filled
As soon as I've validated my engine, all my titles reapeared in all languages.

I've exported my site with page titles filled then reimported. I had exactly the same behaviour