Setting a transparent stage with transparent fill to fullscreen makes the stage filled black

This is reproducible only with franca on mac platforms. Works fine on windows

I'm showing a transparent stage which is filled with transparent color to fullscreen. This makes the stage fullscreen, but the scene is filled with black.

import javafx.scene.*;
import javafx.stage.*;
import javafx.ext.swing.*;
import javafx.scene.shape.*;
import javafx.scene.paint.*;

var fullScreen: Boolean = false;
var opacity: Integer = 100 on replace {
    opacityNum = (opacity / 100.0) as Number;
};
var opacityNum: Number = 1.0 on replace {
    opacity = (opacityNum * 100.0) as Integer;
};
Stage {
    style: StageStyle.TRANSPARENT;
    fullScreen: bind fullScreen
    opacity: bind opacityNum with inverse
    scene: Scene {
        fill: Color.TRANSPARENT
        content: [Rectangle {
            width: 100
            height: 100
            x: 50
            y: 50
            fill: Color.BLUE
        }, SwingSlider {
            minimum: 0
            maximum: 100
            value: bind opacity with inverse
            translateX: 40
            translateY: 200
            width: 80
        }, SwingCheckBox {
            text: "FullScreen"
            selected: bind fullScreen with inverse
            translateX: 40
            translateY: 230
        }]
    }
}