JetGroovy: not adding Groovy source directories to project sources

I made the following exercise:
- checked out mixed Java-Groovy project out of Subversion
- ran through Idea wizard to create new project from existing sources

Idea detected correctly Java sources in my project, then detected Groovy facet (because of some Groovy files existing), but at the end the folder with Groovy source files was not added to project sources.
It took me a while to recognize and correct it.

Should I consider it a bug or a usability problem?

Jetbrainers, please comment.

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