subscriberAddWithCustomFields / Name is not updated / BUG!?

Greetings everybody!

I am pushing updates for some of the subscribers in my list with subscriberAddWithCustomFields:

$result = $cm->subscriberAddWithCustomFields($email, $fullname, array('Vorname' => $firstname, 'Nachname' => $lastname, 'Salutation' => $salut_full, 'Anrede' => $salutation), $list_id, true);

There is a problem — all the fields are updated and confirmation mail fired as a result,
but Name field ($fullname) is not updated.

Any ideas?

Everything works fine when updating through CM generated form, but DOES NOT when pushing it via API.

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