Преобразует WordPress шорткоды до того, как будут преобразованы теги (шорткоды) Contact Form 7.

wpcf7_form_elements.php

<?php
add_filter( 'wpcf7_form_elements', function () {
    $manager   = WPCF7_FormTagsManager::get_instance();
    $form_html = do_shortcode( WPCF7_ContactForm::get_current()->prop( 'form' ) );

    if ( wpcf7_autop_or_not() ) {
        $form_html = $manager->normalize( $form_html );
        $form_html = wpcf7_autop( $form_html );
    }

    $form_html = $manager->replace_all( $form_html );
    //$form_obj->scanned_form_tags = $manager->get_scanned_tags();

    return $form_html;
} );