[Cerrado] Product SKU is not copy to other language version

Background of the issue:
I am trying to create a variable product with two SKUs. It is working fine on the source page, the EN page: enlace oculto. When I completed the translation on DA and FR, I expected all data from the product setup (attribute, shipment, variants) to be duplicated and identical to the source page (EN).

Symptoms:
The SKU numbers are removed due to duplicated SKUs on other language versions, and I received an error message that the SKU on DA and FR are duplicated, which is not allowed on WooCommerce. Other data (attributes, weight, shipment) has to be manually input to other language versions.

Questions:
Why are SKU numbers removed during translation?
How can I ensure all product data is duplicated correctly across language versions?