I checked with the latest 3.80 version with dll file dated 7th of May, and it's still the same. Product URL is formed without any language code. If the site url containes the language code like "/tr", "/en", "/fr" etc, the product url in the feed file is formed as "yoursite.com/productURL" but it should be "yoursite.com/lang/productURL" in order to avoid URL redirection which Google does not like.
Plugin has a language selection in the options but it only uses the selected language to form the feed file name.