Province Combo doesn't update after selection (Profile-Location)

i am using Location inside Profile2. On registration and on profile-edit the province-combo isn't updated via Ajax. The callback-function _location_country_ajax_callback is reached but somehow the combination of fields doesn't work.

The URL is /system/ajax/profile_profile/field_profile_location/und/0

Reproducable with version 3.1. The main problem is that location_cck_field_widget_form in location_cck presumes that the incoming value is on the first level. But when I use the profiles it becomes necessary to check #field_parents