This thread is resolved. Here is a description of the problem and solution.
Problem: The long description sometimes (not for all products) is not visible at the classic translator.
Solution: Normally Translation Editor hides the editor contents in favor of page builder strings when you switch the builder.
Please go to WPML > packages and delete the package of that product: https://take.ms/sni8FO if you see that there. Then update the product. That fixed the issue.
Please note that it will delete the UX builder translated strings permanently. So do this only when moving from UX Builder to native editor permanently not for testing.
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