I think I got it: if I move the is_user_logged_in() part to the bottom of the form, just before the submit button, it correctly passes the user ID to acf_create_new_user(). I suppose that all those instances of acf_form() reset the post ID?
Do you have any thoughts on my other question, why wp_redirect() isn’t working after form submission? To reiterate, I don’t want to use acf_form( 'return' => 'some-url' ) because the redirects are conditional (e.g. user already exists, user was registered, etc.).
