new form tags

Hello,

i took the User ID via form https://bayern.experten-kredite.de/kreditanfrage/

add_shortcode('external_request_id', function() {
    return isset($_SESSION['external_request_id']) ? $_SESSION['external_request_id'] : '';
});

and bring it to the thank you page https://bayern.experten-kredite.de/kreditanfrage/
between Ihre Anfragenummer >> <<
Since the Update of CF7 4.6 it never works anymore.
If i exchange the Code with the newer one “add_form_tag”

add_form_tag('external_request_id', function() {
    return isset($_SESSION['external_request_id']) ? $_SESSION['external_request_id'] : '';
});

nothing happens.
what do I have to do to have the ID reissued?

Thanks
Tilo

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