fileTagsFilter group is overwritten in derived item

// MyProduct.qbs
import qbs

CppApplication {
// ...
    Group {
        name: "a"
        fileTagsFilter: ["application"]
        qbs.install: true
        qbs.installDir: "bin"
    }
}

// project.qbs
import qbs

MyProduct {
// ...
    Group {
        name: "b"
        fileTagsFilter: ["application"]
        fileTags: ["foo"]
    }
}