Thanks for the feedback. I have not installed an “ajax to cart” type plugin. I have tried disabling the “Enable AJAX add to cart buttons on archives” setting in WooCommerce and it still has the same behavior (no product options listed in the email or in the order received/summary). Is there another WooCommerce setting I should be looking at?
I’m running WordPress 5.4.1, WooCommerce 4.1.1, and Extra Product Options (Product Addons) for WooCommerce version 2.1.3.