Custom post action works but validation is lost

I have a hook that modifies the post action URL. It works, but the CF7 form validation stopped working. Any help? Thanks

HOOK:

function cf7_custom_crm_url( $url ) {
  $wpcf7 = WPCF7_ContactForm::get_current();
  $url = 'https://crm.example.com/submit';
  if ( in_category( 'blog' ) ) {
    $wpcf7->skip_mail = true;
    return $url;
  }
}
add_filter( 'wpcf7_form_action_url', 'cf7_custom_crm_url' );

POST ACTION:

https://crm.example.com/submit

https://wordpress.org/plugins/contact-form-7/