Payment not submitted using drupal webform if 'preview' is enabled on it.
The reason is the class used to find the submit button at https://lab.civicrm.org/extensions/stripe/-/blob/master/js/civicrm_stripe.js#L609.
If the preview is enabled on the webform, the button is loaded as -
The submit button does not have the class "webform-submit" in it. Hence no payment intent is created to process the transaction.