Linked Copies: Impossible to publish sub-pages!

I did some cross-site linked copies (with root - section "Société" of the std demo). When publishing the destination, only the parent page is published. All sub-pages in my right menu are not present in live mode.

Looks like the workflow manager is hidding the sub-pages of a linked copy but is also preventing them to be published and not considering them as one single "section block"