Problem: The client is experiencing issues with the '_load_textdomain_just_in_time' function being called incorrectly, causing early translation loading errors across various plugins. Additionally, there are deprecated parameter warnings and 'headers already sent' errors. Solution: We recommend checking each plugin involved and contacting their support teams to ensure they have updated their code to accommodate changes in WordPress version 6.7, where the handling of text domains was modified. For detailed guidance on debugging in WordPress, you can refer to Debugging in WordPress. For the deprecated parameter issue in the WooCommerce Multilingual Plugin, our developers have addressed this, and the fix will be included in the upcoming release of 'WooCommerce Multilingual & Multi-Currency' version 5.5.1.
If this solution does not resolve your issues or seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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 problems persist, please open a new support ticket.
