ScissorStack not working as intended

public class ClipTest extends Group {
    class ClipImage extends Image {
        public ClipImage(Texture texture) {
            super(texture);
        }

        @Override
        public void draw(SpriteBatch batch, float parentAlpha) {
            Rectangle scissors = new Rectangle();
            Rectangle clipBounds = new Rectangle(getX(), getY(), getWidth() * 0.75f, getHeight());

            ScissorStack.calculateScissors(
                    getStage().getCamera(),
                    getStage().getGutterWidth(),
                    getStage().getGutterHeight(),
                    getStage().getCamera().viewportWidth,
                    getStage().getCamera().viewportHeight,
                    batch.getTransformMatrix(),
                    clipBounds, scissors);

            if (ScissorStack.pushScissors(scissors)) {
                super.draw(batch, parentAlpha);
                ScissorStack.popScissors();
            }
        }
    }

    Image background, foreground;

    public ClipTest() {
        setSize(100, 30);

        background = new Image(G.assets.textureSolidBlack);
        background.setSize(getWidth(), getHeight());
        addActor(background);

        foreground = new ClipImage(G.assets.textureSolidWhite);
        foreground.setSize(getWidth(), getHeight() +10);
        foreground.getColor().a = 0.75f;

        addActor(foreground);
    }
}