QtC selects minimum c++ version instead of maximum in QBS project

//hello-17.qbs
import qbs

Project {
    references: ["old-version.qbs"]

    CppApplication {
        consoleApplication: true
        files: "main.cpp"
        cpp.cxxLanguageVersion: "c++17"
        Depends { name: "OldVersion" }
    }
}

//old-version.qbs
import qbs

Project {
    Product {
        name: "OldVersion"
        Export {
            Depends { name: "cpp" }
            cpp.cxxLanguageVersion: "c++11"
        }
    }
}