This thread is resolved. Here is a description of the problem and solution.
Problem: Product properties do not get propagated properly in translated products.
Solution: 1. Go to WPML -> Translation Management -> Multilingual Content Setup. 2. Scroll down to "Custom Field Translation" section. 3. There you'll see a list of all the custom fields registered on your site. You should find there all the fields that are not propagated on secondary language translations. Search for all of them and specify the translation option for each one (selecting the appropriate option next to each field).. 4- Click 'Save' button at the bottom of the section.
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