Layout.left/rightMargin doesn't mirror with LayoutMirroring

import QtQuick 2.7
import QtQuick.Layouts 1.3
Item {
    width: 400
    height: 100
    //LayoutMirroring.enabled: true
    LayoutMirroring.childrenInherit: true
    RowLayout {
        anchors.fill: parent
        Text {
            Layout.leftMargin: 50
            text: "Min."
        }
        Item {Layout.fillWidth: true}
        Text {
            Layout.leftMargin: 50
            text: "Max."
        }
    }
}