Doctrine 2 Remove Bug

gistfile1.php

<?php
require_once 'library/Doctrine/Common/ClassLoader.php';

$classLoader = new Doctrine\Common\ClassLoader('Doctrine', 'library/');
$classLoader->register();

// Set up caches
$config = new Doctrine\ORM\Configuration;
$cache = new Doctrine\Common\Cache\ArrayCache;

$config->setMetadataCacheImpl($cache);
$config->setQueryCacheImpl($cache);
$config->setMetadataDriverImpl($config->newDefaultAnnotationDriver());

// Proxy configuration
$config->setProxyDir(__DIR__);
$config->setProxyNamespace('Proxies');
$config->setMetadataCacheImpl($cache);

// Create EntityManager
$em = Doctrine\ORM\EntityManager::create(array('driver' => 'pdo_sqlite', 'memory' => true), $config);

// setup data
$em->getConnection()->query('CREATE TABLE Bar (
	id INTEGER NOT NULL,
	foo_id INTEGER NOT NULL,
	PRIMARY KEY (id)
)');
$em->getConnection()->query('CREATE TABLE Foo (
	id INTEGER NOT NULL,
	PRIMARY KEY (id)
)');
$em->getConnection()->query('INSERT INTO Foo (id) VALUES (1)');
$em->getConnection()->query('INSERT INTO Bar (id, foo_id) VALUES (20, 1)');

$qb = $em
	->getRepository('Bar')
	->createQueryBuilder('bar1')
	->select('bar1, foo1, bar2')
	->join('bar1.foo', 'foo1')
	->join('foo1.bar', 'bar2')
;

$qb->getQuery()->getResult();

$bar = $em->getRepository('Bar')->findOneBy(array('id' => 20));

$em->transactional(function($em) use ($bar) {
	$em->remove($bar);
	$em->flush();
});

class Base {
	public function __get($name) {
		return $this->$name;
	}
	
	public function __set($name, $value) {
		$this->$name = $value;
	}
}


/** @Entity */
class Bar extends Base {
	/**
	 * @Id @GeneratedValue @Column(type="integer")
	 */
	protected $id;
	
	/** @ManyToOne(targetEntity="Foo", inversedBy="bar") */
	protected $foo;
}

/**  @Entity */
class Foo extends Base {
	/**
	 * @Id @GeneratedValue @Column(type="integer")
	 */
	protected $id;
	
	/** @OneToMany(targetEntity="Bar", mappedBy="foo") */
	protected $bar;
}