Problem: The client reported a bug with WPML causing several well-indexed product pages to disappear on their live site, while these pages showed no errors on their staging site. Solution: We identified a potential conflict between WPML and the Yoast WooCommerce SEO plugin. The error logs indicated a problem with the Yoast WooCommerce SEO plugin's handling of structured data. We recommended deactivating the Yoast WooCommerce SEO plugin to see if the issue resolves. If the client still needs this plugin, we advised contacting the support team of Yoast WooCommerce SEO for further assistance.
Please note that this solution might be outdated or not applicable to your specific case.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 at WPML support forum.
