Dynamic country-select-update-form still doesn't work with inline entity form

A couple previous issues were supposedly fixed, but neither 1.0 nor 1.x-dev work with inline entity form.
#2390719: Address field not working properly with Inline Entity Form
#1662680: Stop duplicating form state values in $form_state['addressfield']

I'm using a non-required addressfield on an ECK in an inline entity form, with no default country.
When I choose a country, some ajax happens, and when it's complete the form doesn't get updated.

When I set a default country on the same non-required field, the initial address form appears properly.
However, after choosing a new country, the ajax still doesn't update the form.