I have a stage with some scene to display. I want to realize a FadeIn/Out animation for the stage so I manipulate the stage.opacityProperty() within a Timeline using some KeyFrames.

The fading only gets visible with the default StageStyle. If I set the stage style to StageStyle.TRANSPARENT, the timeline changes the opacity, but the stage remains on the last set opacity value until something changes within the scene and causes a "repaint".