Run this code on linux b64 and b65

package javafxapplication16;

import com.sun.javafx.runtime.VersionInfo;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class JavaFXApplication16 extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(final Stage stage) throws Exception {
        final Button b = new Button("Press me");

        VBox vb = new VBox();
        vb.getChildren().addAll(b);
        final Scene scene = new Scene(vb, 300, 300);

        b.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent t) {
                System.out.println("X:" + stage.getX() + " Y:" + stage.getY());
                System.out.println("X:" + scene.getX() + " Y:" + scene.getY());
            }
        });
        stage.setTitle(VersionInfo.getRuntimeVersion());
        stage.setScene(scene);
        stage.show();
    }
}


Output on b64:
X:808.0 Y:269.0
X:2.0 Y:23.0

Output on b65:
X:808.0 Y:269.0
X:0.0 Y:0.0

Look on the second line of output: scene coordinates on b65 don't take decoration into account.