Add break on Zend_Application_Bootstrap_BootstrapAbstract::_resolvePluginResourceName($resource) foreach loop:

protected function _resolvePluginResourceName($resource)
{
    if (isset($resource->_explicitType)) {
        $pluginName = $resource->_explicitType;
    } else  {
        $className  = get_class($resource);
        $pluginName = $className;
        $loader     = $this->getPluginLoader();
        foreach ($loader->getPaths() as $prefix => $paths) {
            if (0 === strpos($className, $prefix)) {
                $pluginName = substr($className, strlen($prefix));
                $pluginName = trim($pluginName, '_');
                break;    // break when $prefix found
            }
        }
    }
    $pluginName = strtolower($pluginName);
    return $pluginName;
}