Rectangle transparency problem

When a Rectangle's color has been set to "#00RRGGBB", and a border.color has been set to something, the Rectangle will display as black, instead of transparent. This does not happen if border.color is omitted. Setting the color of the Rectangle to "transparent" works fine, much like setting the color of the alpha channel to something that is not 00. A test can be made by making a standard "Qt Quick Application" with a qml file that looks something like:

Rectangle
{
    //...
    color: "#00ff0000"
    border.color: "blue"
    //...
}

An example QML file has been included.