ADDITIONAL SYSTEM INFORMATION :
JavaFX- 21.0.1, java - openjdk version "21.0.1" 2023-10-17, OS - Ubuntu 20.04.3 LTS.

A DESCRIPTION OF THE PROBLEM :
When I click on color picker first time then there is an extra white rectangle. As I understand this is rectangle for white color. However, it must be shown when mouse is on white color but NOT when user click color picker to open it. <ImageOne.png>

When I click on color picker second time then everything is ok - no white rectangle. <imageTWO.png>

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run JavaFxTest7 and click on color picker to open it.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
When user click on color picker to open it there must be no white rectangle.
ACTUAL -
When user click on color picker to open it there is a white rectangle.

---------- BEGIN SOURCE ----------
    public class JavaFxTest7 extends Application {
    
        public static void main(String[] args) {
            launch(args);
        }
    
        @Override
        public void start(Stage primaryStage) {
            VBox root = new VBox();
            ColorPicker picker = new ColorPicker(Color.CORAL);
            root.getChildren().addAll(picker);
    
            var scene = new Scene(root, 400, 300);
            primaryStage.setScene(scene);
            primaryStage.show();
        }
    
    }
---------- END SOURCE ----------

FREQUENCY : always