[Gelöst] WPML & Yoast: Metadata not working for duplicated posts

Background of the issue:
I am trying to create duplicate posts in ES-MX based on posts in ES. I want to keep all the content synchronized, including the Yoast metadata (title and description). I have created a test post called 'Prueba metas.' In the ES version, the Yoast section shows the title as 'META TITLE' and the description as 'META DESCRIPTION.' Here is a link to a page where you can see the issue: versteckter Link

Symptoms:
The metadata (title and description) is populating correctly in the ES-MX page in the backend (Yoast section), but it is not displayed on the front end. If I change the metadata in the original ES post, it seems that the new values are populated in the ES-MX backend, but the front end continues to display the previous ES metadata.

Questions:
Why is the metadata populating correctly in the ES-MX backend but not displaying on the frontend?
How can I keep Yoast metadata synchronized between ES and the duplicated ES-MX version and ensure it displays correctly on the frontend?