magento2: Shipping Country Selector Not Sending Correct Country ID on Change to Shipping Methods

Steps to reproduce

1. Install Magento from latest develop branch
2. Enable onepage checkout
3. Change shipping country (not signed in)

Expected result

1. country_id is set correctly and passed to shipping methods example : “CA” when selecting Canada

Actual result

1. country_id is always sent as US regardless of selection

Request Body on estimate-shipping-methods {“address”:{“region_id”:“0”,“country_id”:“US”,“postcode”:“A1B 2C2”}}