I've just started with ZF, so maybe its not actualy a bug, but for me its an unexpected thing. I'm using route with * modifier to accept additonal params via url. Next is code from docs, the only modification is "/*" in the end of the route

// the following route is added to the ZF router
Zend_Controller_Front::getInstance()->getRouter()->addRoute(
    'article_view', // route name
    new Zend_Controller_Router_Route(
        'a/:id/*',
        array(
            'module'     => 'news',
            'controller' => 'article',
            'action'     => 'view',
            'id'         => null
        )
    )
);

// a page is created with a 'route' option
$page = new Zend_Navigation_Page_Mvc(array(
    'label'      => 'A news article',
    'route'      => 'article_view',
    'module'     => 'news',    // required for isActive(), see note above
    'controller' => 'article', // required for isActive(), see note above
    'action'     => 'view',    // required for isActive(), see note above
    'params'     => array('id' => 42)
));

// returns: /a/42
$href = $page->getHref();

Actualy will return /a/42/module/news/controller/article/action/view module, controller and action were treated as url parameters.