Nested QML Windows not respecting width and height attributes on Android and iOS

Nested QML Windows are not respecting the width and height attributes and they are occupying full screen space. Observed this issue on Android and IOS platforms. Provided sample code below to reproduce the bug.

Window {
    width: 640
    height: 480
    color: "red"
    visible: true
    Window {
        width: 300
        height: 300
        visible: true
        color: "blue"
    }
}