site-deploy with flat project layout generates wrong url for breadcrumb

The site plugin generates a wrong default url when executing the site-deploy goal (the link pointing to the project.url?)
It is a bit weird the ${project.url} is referenced to calculate the relative links. That was a but unexpected. The site deploy url often contains scp:// urls while project.url points to the web location. If we map subdomains to projects this sort of never works as the site deploy url and the project-url have no common url parts.

There is no configuration to adjust the flat layout for the site plugin?

I'll attach an example project and a screenshot.

There are similar issues reported with the breadcrumb navigation.