Error on email previews w/WC 9.7.0 when “email enhancements” enabled

After updating to WC 9.7.0, we tested the experimental “email enhancement” feature (WooCommerce > Settings > Advanced > Featured).

When this feature is enabled, all order-related email previews (WooCommerce > Settings > Email) throw the following error:

“Uncaught Error: Call to a member function get_tax_status() on bool
in /nas/content/live/xxxxxx/wp-content/plugins/product-bundles-variation-bundles/product-bundles-variation-bundles.php on line 645″

This error persists when we switch to the default Storefront theme. The error goes away when we disable the variation bundles plugin.

Entire call stack:

1. WC_PB_Variable_Bundles::variation_get_tax_class('', WC_Product_Variation)
   wp-includes/class-wp-hook.php:324
2. WP_Hook::apply_filters('', array)
   wp-includes/plugin.php:205
3. apply_filters('woocommerce_product_variation_get_tax_class', '', WC_Product_Variation)
   wp-content/plugins/woocommerce/includes/class-wc-product-variation.php:309
4. WC_Product_Variation::get_tax_class()
   wp-content/plugins/woocommerce/includes/abstracts/abstract-wc-order.php:1581
5. WC_Abstract_Order::add_product(WC_Product_Variation)
   wp-content/plugins/woocommerce/src/Internal/Admin/EmailPreview/EmailPreview.php:309
6. Automattic\W\I\A\E\EmailPreview::get_dummy_order()
   wp-content/plugins/woocommerce/src/Internal/Admin/EmailPreview/EmailPreview.php:162
7. Automattic\W\I\A\E\EmailPreview::set_email_type('WC_Email_New_Order')
   wp-content/plugins/woocommerce/includes/admin/class-wc-admin.php:204
8. WC_Admin::preview_emails('')
   wp-includes/class-wp-hook.php:324
9. WP_Hook::apply_filters(NULL, array)
   wp-includes/class-wp-hook.php:348
10. WP_Hook::do_action(array)
    wp-includes/plugin.php:517
11. do_action('admin_init')
    wp-admin/admin.php:175
12. require_once('/nas/content/live/umcdstore/wp-admin/admin.php')
    wp-admin/index.php:10