gradle: buildSrc from included builds not recognized

Hello,

I wonder why IntelliJ's gradle importer does not recognize the buildSrc from an "included" build (I'm working with a composite build).
I am referring to the gradle samples (this one: https://github.com/gradle/gradle/tree/master/subprojects/docs/src/samples/compositeBuilds/declared-substitution), extending the compositeBuilds/declared-substitution example by adding a buildSrc folder to both gradle project folders, namely into
* my-app, which is the composite build, including anonymous-library in its settings.gradle, and
* anonymous-library, the 'included' build.

In Intellij I open my-app/build.gradle as gradle project, and I see (as in the screenshot)
* my-app/buildSrc from the composite build is recognized as a gradle project => Good
* anonymous-library/buildSrc from the included build is not recognized as a gradle project => Bad
Thus anonymous-library/buildSrc/src/main/groovy/ is not marked as source folder.
I dont't think this behaviour is correct.

Jan