This thread is resolved. Here is a description of the problem and solution.
Problem:
If you're experiencing issues where custom fields appear empty in translated posts despite being set to 'copy' in WPML settings, you might be facing a common synchronization problem.
Solution:
We recommend trying to open any of the original posts and resaving them. This action can often trigger the synchronization process needed to populate the custom fields in the translated versions. Alternatively, you can use the bulk edit feature to resave multiple posts at once. For detailed instructions on how to perform bulk edits, please visit Bulk Edit Documentation.
If these steps do not resolve your issue, or if the solution seems outdated or irrelevant to your specific case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the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 do not hesitate to open a new support ticket with us for further assistance at WPML Support Forum.
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