Draft Order does not respect 'Preselect the sign-up option' - BUG

[DiscountNinja]

Merchants can specify that they want the sign-up checkbox at checkout to be preselected.

This is done in the Checkout settings (admin/settings/checkout):

These settings are respected when:

- using a standard checkout

- using a checkout generated by the Checkout API

However, when using the Draft Order API, only the first option is respected. The 'Preselect the sign-up option' is not.

The result is that the checkbox at checkout is never checked:

This issue can be reproduced in the 2020-10 and 2020-07 versions of the API.

[KriYor]

Same issue.