Save nested relationship on create

I do have the following nested structure:

-> user

--> person

---> primaryEmail

All these are defined by

morphOne

morphOne

morphOne

morphOne relationships.

When I

create

create

create

create a new user only the

person

person

person

person gets saved but not the

primaryEmail

primaryEmail

primaryEmail

primaryEmail relationship.

When I

edit

edit

edit

edit an existing user model everything is working properly.

How can I get this working?

This screenshot shows the nesting: