Setting the DropShadow effect on the Group vs. on individual children in that Group returns different bounds results.
It seems like boundsInLocal and boundsInParent should return the same result (though layoutBounds should be different).

var g1:Group;
Stage {
    var scene:Scene;
    scene: scene = Scene {
        width: 200
        height: 200
        content: g1 = Group {
            effect: DropShadow {}
            content: [
                Rectangle {
                    x: 10 y: 30 width: 40 height: 40
                    fill: Color.WHITE
                }
                Rectangle {
                    x: 60 y: 30 width: 40 height: 40
                    fill: Color.BLACK
                    rotate: 45
                }
            ]
        }
    }
}
println("group1 boundsInLocal={g1.boundsInLocal}");
println("group1 boundsInParent={g1.boundsInParent}");
println("group1 layoutBounds={g1.layoutBounds}");

var g2:Group;
Stage {
    var scene:Scene;
    scene: scene = Scene {
        width: 200
        height: 200
        content: g2 = Group {
            content: [
                Rectangle {
                    x: 10 y: 30 width: 40 height: 40
                    fill: Color.WHITE
                    effect: DropShadow {}
                }
                Rectangle {
                    x: 60 y: 30 width: 40 height: 40
                    fill: Color.BLACK
                    rotate: 45
                    effect: DropShadow {}
                }
            ]
        }
    }
}