Resolved by author
Overview of the issue
If you are using WooCommerce Integration for MEC, you will experience that when events are added to the cart in the default language do not appear when switching to a translated language. This issue persists even when attempting to purchase events directly from a secondary language.
Workaround
Please, make sure of having a full backup of your site before proceeding.
- Go to Woocommerce > Woocommerce Multilingual > Settings > Cart page.
- Active the Prompt for a confirmation and reset the cart option
- Go to WPML > Settings > Post Type Translation page.
- Set the product post type as Display as Translated.