I am afraid I am doing something that masses up everything, so I open this ticket.
I get the error: We have seen that the product_type field was set incorrectly for some product translations. This happens because the product_type taxonomy was translated. You can solve this on the WooCommerce Multilingual problem solving page.
When you say that the product_type field was set incorrectly, what's the exact element that are we talking about? Is it the category or maybe the tag? I just need a bit more info about this in order to understand what's going on, and look for a fix.