wagon doesn't deploy seo_title, meta_keywords or meta_description for content_entries

[greyskin]

Given the following **/app/content_types/my_content_type.yml

display_settings:
    seo: true
    advanced: true
    position: 1
    hidden: false

and /data/development/my_content_type.yml

- My Entry:
    _slug: my-entry
    enabled: true
    name: My Entry
    img: "/samples/_development/content_entries/my-image.jpg"
    seo_title: My Entry
    meta_keywords: test
    meta_description: test
    _id:
    - 123456789123456789123456
    - my-entry

...and running

wagon deploy staging -r content_entries -f -my-content-type -d -e development

results in a successful deploy of the content_entry to the staging platform, except seo_title, meta_keywords and meta_description are ignored.