Task changes not sending notifications

When editing a Task node, notifications are not sent.
This is caused by:

function oa_worktracker_oa_messages_type_alter(&$message_type, $context) {
  // TODO: replace the oa_create with something else too...
  if (in_array($message_type, array('oa_update', 'oa_comment')) && $context['entity']->type == 'oa_worktracker_task') {
    // tell OpenAtrium not to create a message for this! We'll handle it ourselves..
    $message_type = NULL;
  }
}

When updating a Task via the comment form (comment_alter), notifications do get sent. This is implemented by oa_worktracker_comment_insert().