Reported for: WooCommerce Multilingual 3.4.2
Resolved in: WooCommerce Multilingual 3.4.3
Steps to reproduce:
Translate a product and then the edit translation. The option “Visible on the products page” is not inactive.
In order to keep products and their translations in sync, WooCommerce Multilingual locks some of the fields on the WooCommerce editor for products translations so they are not accidentally overridden.
Do not change the “Visible on the products page” option on translated products.
This is fixed in WooCommerce Multilingual 3.4.3-beta1