Gradle multi-project, using a custom-named main build-file

This project shows an issue with Gradle multi-projects. When the main build script has custom name, the call to gradle command should be:

./gradlew --no-daemon --build-file custom-name.gradle tasks

The settings.gradle file includes the children projects, (and it is processed, at least the println). But when listing all the projects from main build script only the root project appears:

<settings> :client
<settings> :service
<custom> [root project 'gradle-multi-project-custom-buildfilename']
> rootProject.name: gradle-multi-project-custom-buildfilename
> project.name: gradle-multi-project-custom-buildfilename
:tasks
...

It does not apply the rootProject.name property neither. Does not work even adding the --settings-file flag to the command line.

Asked in this thread from Gradle forums if this is an expected behaviour.

Tested with Gradle 3.0 and 3.2.1 (uploaded wrapper 3.2.1).