When using nodetypes on cluster.config to restrict, the link picker is still selecting any document.

When I configure a cluster.options (within frontend:pluginconfig) with a documenttype to restrict the link picker to select only a limited set of documenttypes, it still enables me to select any document of any type (as long as it is a document).
The method NodePickerController.isValidNodeType() on line 261 should return false if the restricted type is not found. This method always returns true if the node is document.