Hello Bigul, I have some new info that may be handy with our issue
Last week I detected some posts that were not on the wp-admin thanks to Yoast SEO sitemaps, the permalink also throwed a 404, after some debugging I clicked on the option "Add missing language info" from the WPML Troubleshooting page
Doing so, a lot of posts were added to the Catalan language, and I deleted all of them, not sure if this could be related to the duplication issues, but some of the posts with missing language had the same reference of the posts having trouble
We have an update. If we delete the Properties posts from all three languages and then import it again we won't see the issue. The first import is fine and the problem happens when updating the existing import.
It looks like when WP All Import detects a duplicate post and it converts the ID to the current language. If there is no translation available in the current language then it does not mark the post as duplicate and create a new one.
So please make sure there is no duplicate post with the same custom fields in other languages that are not connected to translation or original. If the same custom field posts are connected correctly with the original then the issue won't happen.
Please check the following post as an example. It has the same custom field(Referencia: 2835). But it is not connected to any post. Because the duplicates of these posts are created each time the import is running.
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Thanks!
Bigul
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