TreeTableView Indention Rendering Issue in TreeStructureColumn

I noticed a rendering issue within the TreeStructureColumn-Cells, when creating a TreeTableView with setShowRoot( false ). As long as every Root-Child has no children, their indention is not correctly calculated. It is set directly to the border of the cell, instead of beeing aligned with the other Root-Children with Children. After the first Root-Child has children, further Root-Children without Children are displayed correctly. When resizing the Stage or using the handles, the idention is correct again.

I created a small example to demonstrate the issue:

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.stage.Stage;

public class TreeTableViewIndentErrorMain extends Application
{
    @Override
    public void start( final Stage primaryStage )
    {
        TreeItem<String> root = new TreeItem<>( "Root" );

        TreeItem<String> item1 = new TreeItem<>( "Item1" );
        TreeItem<String> item2 = new TreeItem<>( "Item2" );
        TreeItem<String> item3 = new TreeItem<>( "Item3" );
        TreeItem<String> item4 = new TreeItem<>( "Item4" );

        root.getChildren().add( item1 );
        root.getChildren().add( item2 );
        item2.getChildren().add( item3 );
        root.getChildren().add( item4 );

        TreeTableColumn<String, String> column = new TreeTableColumn<>( "Column" );
        column.setCellValueFactory(p -> new ReadOnlyStringWrapper( p.getValue().getValue() ));

        final TreeTableView<String> treeTableView = new TreeTableView<>( root );
        treeTableView.getColumns().add( column );
        treeTableView.setShowRoot( false );
        treeTableView.setColumnResizePolicy( TreeTableView.CONSTRAINED_RESIZE_POLICY );

        Scene scene = new Scene( treeTableView, 400, 400 );
        primaryStage.setScene( scene );
        primaryStage.show();
    }

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

PS: Honestly I didnt really know what affected Version to choose, so i just picked the latest released Version, since I currently use the latest JDK Version (1.8.0-b132).