Klaviyo intermittently breaks checkout

[adamlavery]

Environment details

PHP version: 8.1
Magento version: 2.4.6
Klaviyo extension version: 4.2.0
BSS One Step Checkout: 2.3.9

Steps to reproduce

1. Flush the Magento cache (admin, cache management)
2. Open an incognito/private browser tab (to ensure no local cache)
3. Add a product to cart (can be any)
4. Go to checkout - no email field, place order does nothing.
5. Refresh and email is there; order can be placed once entered.

Expected result

Email field appears reliably

Actual result

Email field is not there, can't place order.

Additional information

Every time this happens, the following is logged in console:

    bindEmailListener: function () {
      // jquery overrides this, so let's create an instance of the parent
      var self = this;
      console.log('Klaviyo_Reclaim - Binding to #customer-email');
      jQuery('#maincontent').delegate('#customer-email', 'change', function (event) {
        if (!self.isKlaviyoActive()) {
          return;
        }

        self._email = jQuery(this).val();
        if (!window.klaviyo.isIdentified()) {
          window.klaviyo.push(['identify', {
            '$email': self._email
          }]);
        }
        self.postUserEmail(self._email);
      });
    },

Disable Kalviyo integration and the issue goes. Once the checkout is cached, that code never runs (no console log) and the issue does not occur.

[smoucka]

@adamlavery Thank you for submitting this issue. We will look into it and follow up soon.

[adamlavery]

Ok, thanks. Apparently ticket 3496870 has been created for this. If you can loop me into that ticket then I can assist wth confirming the issue and finding a fix.