In a Swing embedded JavaFx application, during drag and drop gesture, the mouse cursor does not show the correct allowed or forbidden state.
Please run the test program:
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import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Scene;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;

public class DndJavaFxSwing {

    private void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);

        JFrame frame = new JFrame("Dnd JavaFX with Swing");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel();
        mainPanel.setPreferredSize(new Dimension(600, 400));
        final JFXPanel fxMainPanel = new JFXPanel();
        mainPanel.add(fxMainPanel, "0,0");

        // create JavaFX scene
        Platform.runLater(() -> createScene(fxMainPanel));

        frame.getContentPane().add(mainPanel);

        frame.pack();
        frame.setVisible(true);
    }

    private void createScene(JFXPanel fxMainPanel) {
        Pane root = new HBox();

        Pane dndSource = new StackPane();
        dndSource.setPrefSize(200, 200);
        dndSource.setStyle("-fx-background-color: blue");
        dndSource.setOnDragDetected(event -> {
            Dragboard db = dndSource.startDragAndDrop(TransferMode.COPY);
            ClipboardContent content = new ClipboardContent();
            content.putString("test");
            db.setContent(content);

            event.consume();
        });

        Pane dndTargetAllowed = new StackPane();
        dndTargetAllowed.setPrefSize(200, 200);
        dndTargetAllowed.setStyle("-fx-background-color: green");
        dndTargetAllowed.setOnDragOver(event -> {
            System.out.println("Drag over allowed");
            event.acceptTransferModes(TransferMode.COPY);
            event.consume();
        });


        Pane dndTargetForbidden = new StackPane();
        dndTargetForbidden.setPrefSize(200, 200);
        dndTargetForbidden.setStyle("-fx-background-color: red");
        dndTargetForbidden.setOnDragOver(event -> {
            System.out.println("Drag over forbidden.");
            event.acceptTransferModes(TransferMode.MOVE);
            event.consume();
        });

        root.getChildren().addAll(dndSource, dndTargetAllowed, dndTargetForbidden);

        fxMainPanel.setScene(new Scene(root, 600, 400));
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            DndJavaFxSwing swingView = new DndJavaFxSwing();
            swingView.createAndShowGUI();
        });
    }

}
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Behaviour of the DnD:
Drag source:
No document symbol is displayed over the DnD source, but only an empty grey rectangle -> Document symbol missing?
Drag target (allowed):
Allowed symbol (green plus sign) is displayed only for a very short time interval (when the mouse enters the target pane) and thereafter it disappears.
Sometimes it appears again occasionally, it seems to appear on mouse entered event -> Green plus should be displayed al the time when the mouse is dragged over the allowed pane.
Drag target (forbidden):
Forbidden symbol is also displayed only for a very short time interval (when the mouse enters the target pane) and thereafter it disappears.
Sometimes it appears again occasionally, it seems to appear on mouse entered event -> Expected behaviour: to see the forbidden sign all the time when the mouse is dragged over the forbidden pane.