Dissociation of taxonomy when an action is performed with cclink.

I have several content taxonomy fields in my content type. When I perform a custom PHP action with the workflow-ng module:
$node->field_pro_question = array(0 => array('value' => 'Oui'),);
return array("node" => $node);
by a cclink action, (I use the "now option") than I loose all the content taxonomy fields datas.
Do you have a idea ?
Benjamin

Dissociation of taxonomy when an action is performed with cclink.