Import Builder doesn't use default table class name

I use Symfony 1.2.9 with Doctrine 1.2 trunk.

I also make use of the new Doctrine's feature to specify custom table class. For that, in the config/ProjectConfiguration.class.php I have the following code:

   public function configureDoctrine(Doctrine_Manager $manager)
   {
      ...
      $manager->setAttribute(Doctrine::ATTR_TABLE_CLASS, 'Platform_DoctrineTable');
      ...
   }

And that works fine. But when I comment out this line and re-generate model classes, I get broken table class definitions like:

class AccountTable extends 
{

}

Notice the lack of base class name.

It seems the problem resides in Doctrine_Import_Builder's constructor:

    public function __construct()
    {
        $this->_baseTableClassName = Doctrine_Manager::getInstance()->getAttribute(Doctrine_Core::ATTR_TABLE_CLASS);
        $this->loadTemplate();
    }

So, the default value of $this->_baseTableClassName always overwrites by Doctrine_Core::ATTR_TABLE_CLASS attribute value.