How can I use hooks in functions.php to make Contact form 7 substitute my class to the form when checking fields??

Question

WordPress

Currently, Contact Form 7 submits a class to the form .invalidwhen trying to Submit with blank required fields. How to make hooks to substitute a class for example .was-validated?

This is how you can simply add a class to the form:

function wpcf7_form_class_attr_onvalidate( $class ) {
  $class .= ' was-validated';

  return $class;
}

But this is how it adds when the document is loaded. But how to make it added at the time of form validation, which occurs when the Submit button is pressed, and even the very form for which the button was pressed?
Do you also need to add a class to .is-invalidinputs that received an error during validation?