WPML Multilingual & Multicurrency for WooCommerce - Default attributes not synced properly

Overview of the issue

In WPML Multilingual & Multicurrency for WooCommerce, it may occur that when translating a variable product, the default variation in the second language is either missing or incorrectly set to 0.
This happens when the term_id and term_taxonomy_id values differ, which can occur with global product attributes.

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Open …/woocommerce-multilingual/classes/Synchronization/Component/Attributes.php file.
• Look for line 137.
• Replace:

  $defaultTermIdTranslations = $this->elementTranslations->get_element_translations( $defaultTermId, false, true );
  

• With:

  $defaultTermIdTranslations = [];
  

• On the same file, look for line 149 and replace:

  $translatedDefaultTermId = $this->elementTranslations->element_id_in( $defaultTermId, $language );
  

• With:

  $translatedDefaultTermId = apply_filters( 'wpml_object_id', $defaultTermId, $sanitizedAttributeName, false, $language );
  

• After applying these changes, you need to manually save or update the products with this issue.