existing values not loaded

I'm using the multiselect widget, with multiple values allowed in the content type. beta 3 of nodereference, drupal 7.2

I created a simple nodereference field, allowing node of type basic page. I created a node and added
some references.

If I save the node, I see the fields are stored in the field_revision_field_xxx table.

If I try editing the node again, the existing data does not appear on the form.