A DESCRIPTION OF THE PROBLEM :
This issue is similar to JDK-8157398. Code sample is slightly different: more deep tree nesting.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
To reproduce just launch samle code and collapse root tree - you will see that child treeItem graphics are still visible.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
TreeItem graphics is invisible when parent item is collapsed.
ACTUAL -
TreeItem graphics is still visible.

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeTableColumn;
import javafx.scene.control.TreeTableView;
import javafx.scene.layout.StackPane;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class JavaFXtestUI extends Application {
    public static void main(String[] args) {
        launch(args);
    }
     
    @Override
    public void start(Stage primaryStage) {
        TreeItem<String> treeItemRoot = new TreeItem<> ("Root", new Rectangle(10, 10));
        treeItemRoot.setExpanded(true);

        for (int i = 0; i < 5; i++) {
            TreeItem<String> nodeItemA = new TreeItem<>("Item A", new Circle(10));

            for (int j = 0; j < 5; j++) {
                TreeItem<String> nodeItemB = new TreeItem<>("Item B", new Rectangle(10, 10));
                nodeItemA.getChildren().add(nodeItemB);
            }
            treeItemRoot.getChildren().add(nodeItemA);
        }

        TreeTableView<String> treeView = new TreeTableView<>(treeItemRoot);
        TreeTableColumn<String, String> column = new TreeTableColumn<>("Column");
        column.setCellValueFactory(pTreeItem -> new ReadOnlyStringWrapper(pTreeItem.getValue().getValue()));
        treeView.getColumns().add(column);

        StackPane root = new StackPane();
        root.getChildren().add(treeView);
        Scene scene = new Scene(root, 300, 250);
         
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}
---------- END SOURCE ----------

FREQUENCY : always