Registration: username as email, duplicated fields, avatar, visibility issue

Thanks for this Anh!
The email as username flag works fine as far as I can tell.
Unfortunately I still see duplicated fields in the form generated in the shortcode for the registration form.

This is my shortcode:
[mb_user_profile_register form_id="profile-form" id="registration-fields" id_username="email" id_password="password1" id_password2="password2" label_submit="Register" confirmation="Your account has been created successfully." email_as_username="true"]

Am I doing something wrong?

Here is my meta box setup for this:

$meta_boxes[] = [
            'title'  => '',
            'id'     => 'registration-fields',
            'type'   => 'user', // NOTICE THIS
            'fields' => [
                [
                    'id'   => 'first_name', // THIS
                    'name' => 'First Name',
                    'type' => 'text',
                ],
                [
                    'id'   => 'last_name', // THIS
                    'name' => 'Last Name',
                    'type' => 'text',
                ],
                [
                    'id'   => 'email', // THIS
                    'name' => 'E-Mail',
                    'type' => 'email',
                ],
                [
                    'id'   => 'password1', // THIS
                    'name' => 'Password',
                    'type' => 'password',
                ],
                [
                    'id'   => 'password2', // THIS
                    'name' => 'Confirm Password',
                    'type' => 'password',
                ],
                [
                    'id'   => 'gender', // THIS
                    'name' => 'Gender',
                    'type' => 'radio',
                    'options' => array('m'=>'M','f'=>'F'),
                ],
                [
                    'id'   => 'birthday', // THIS
                    'name' => 'Date of Birth',
                    'type' => 'date',
                    //'readonly' => true,
                    'js_options' => array(
                        'dateFormat'      => 'dd-M-yy',
                        'changeYear'      => true,
                        'yearRange'       => "1930:2010"
                    ),
                    'save_format' => 'Y-m-d',
                ],
                [
                    'id'   => 'country', // THIS
                    'name' => 'Country',
                    'type' => 'select_advanced',
                    'options' => $this->countries,
                ],
                [
                    'id'   => 'privacy', // THIS
                    'name' => 'Privacy Policy',
                    'type' => 'checkbox',
                    'desc' => 'I have read and agree to the <a href="/privacy" target="_blank" rel="noopener noreferrer">Privacy Policy</a>',
                    'required' => 'This field is required to complete registration',
                ],
            ],
        ];

OK, that works, but I can't decide the order of the fields. Can live with it but would be nice to be able to put i.e. first name and last name above the email and password fields.

One more thing, can I hide the password field and have WP generate one and send it in email with the welcome message?

Unfortunately, it’s not possible. I guess you’re tailoring the registration progress, aren’t you?

Yes, and in the past I did it with a fully custom plug-in.
Will probably use something else if they want further customisation of the process.

Please note: after update the calendar for the "date of birth" date field isn't showing up anymore. Is this just me or something broke on your side?