Using the browser's back button disables checkout button on cart form

Also have this issue while using Firefox or Edge back buttons. Not an issue in Chrome.

Seems this is issue is also present in plain vanilla Drupal core forms: 🐛 Prevention of multiple submits blocks use of back navigation Active

Here is a workaround using Javascript.
You only need to include this file on webpages where you want to prevent this bug to happen.
The idea is simple : if the page was loaded from browser cache, i want to force the refresh so drupal may rebuild the form.

/**
 * @file
 * This script forces the page to fully load, without caching.
 * This is helpfull to prevent forms being broken when accessed through the back button.
 */
(function (Drupal) {
  Drupal.behaviors.preventCache = {
    attach: function (context, settings) {
      // Ensure this runs only once per page load
      if (!context.querySelector || context.querySelector('[data-drupal-cache-prevented]')) {
        return;
      }

      // Reload the page if loaded from cache (back/forward navigation)
      window.onpageshow = function (event) {
        if (event.persisted) {
          location.reload();
        }
      };

      // Mark the page to avoid duplicate execution
      document.body.setAttribute('data-drupal-cache-prevented', 'true');
    }
  };
})(Drupal);