set_cookie error with ChromeDriver

[thbar]

Using hound master version and ChromeDriver 2.45.615355, if I serialise a cookie during a session, then I deserialise it to call set_cookie, I get the following error:

     ** (RuntimeError) unable to set cookie
       (Session info: headless chrome=71.0.3578.98)
       (Driver info: chromedriver=2.45.615355 (d5698f682d8b2742017df6c81e0bd8e6a3063189),platform=Mac OS X 10.14.2 x86_64)

The chromedriver --verbose logs shows:

[XXX][INFO]: [YYYY] RESPONSE AddCookie ERROR unable to set cookie
  (Session info: headless chrome=71.0.3578.98)

For the record, here is the code I'm using:

# after a successful run on a page, I'm capturing the cookies
File.write! cookies_file, :erlang.term_to_binary(cookies())

# then in a later run, I'm doing:
if File.exists?(cookies_file) do
  cookies_file
  |> File.read!
  |> :erlang.binary_to_term
  |> Enum.each fn(x) ->
    set_cookie(x)
  end
end

I'm not sure exactly if this is caused by ChromeDriver itself, or the way hound implements add-cookie (W3C spec: https://w3c.github.io/webdriver/#add-cookie).