register_form, custom field not submitted on first try

In the documentation for register_form is a mention of user_register under hooks which is used to:

This action hook allows you to access data for a new user immediately
after they are added to the database. The user id is passed to hook as
an argument.

Typically, this hook is used for saving additional user meta passed by
custom registration forms.

changing register_form to user_register fixed the issue and let me do additional data handling when the registration is completing

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