Setting up upsell for a multilingual website (WPML)

i want to set up some upsells for a multilingual website – english and chinese.

i’m using wpml for the translation. when translating, wpml creates a duplicate of a product which means, there are 2 versions – 1 for english and 1 for chinese.

how do i set up the upsell so the product’s chinese version appears on the translated cart page only?

from what i’m seeing in the product selector dropdown, j cart recognises both versions of the product as separate products.

english – https://paste.pics/RCNUM / chinese – https://paste.pics/RCNVA

here’s an example from the website https://berlanco.com.my/zh-hans/cart/

The page I need help with: [log in to see the link]