Using CiviCRM 5.45.4, Drupal 7.87, Webform 7.x-4.24, Webform CiviCRM 7.x-5.7. I see a number of questions here and issue reports on the Civi webform issues list but I don't see any confirmation this has ever been resolved. I have two sites where the Paypal button does not work - one is using Zurb, one is using Bootstrap, so it doesn't seem to be specific to a theme. The button doesn't generate any console errors, it just generates an error message in the page that the billing profile fields aren't populated (which they shouldn't have to be, if a person chooses to use Paypal). I know we can hide the button with CSS, but not only does that skirt the Paypal user agreement (which I think requires the inclusion of the button option) but also doesn't really solve the problem.