lookup with attached Scene and parent

gistfile1.java

package bugs;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPaneBuilder;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.AnchorPaneBuilder;
import javafx.scene.layout.StackPaneBuilder;
import javafx.stage.Stage;

public class LookupShowJava extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        AnchorPane p = AnchorPaneBuilder.create()
            .children(
                ScrollPaneBuilder.create()
                    .id("foo")
                    .content(
                        StackPaneBuilder.create()
                            .id("bar")
                            .build())
                    .build())
            .build();
        
        stage.setScene(new Scene(p));
        //stage.show();
        
        System.out.println(p.lookup("#foo"));                // Prints: ScrollPane[id=foo, styleClass=scroll-pane]
        System.out.println(p.lookup("#foo").lookup("#bar")); // Prints: null
    }
}

Uncomment line 30 and the second println will print: StackPane[id=bar]