Problem: You are experiencing 404 errors on all French product pages, while other languages and the homepage remain unaffected. The issue persists even after re-saving permalinks and translations. Solution: We recommend checking the translation of your French product base URL in WPML Multilingual & Multicurrency for WooCommerce under the shop-URLs section. It's possible that the URL translation was altered unintentionally. Correcting this should resolve the 404 errors on your French product pages.
Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket.