Did you add the code outside of The Loop? If you did, you need to pass the post/page ID as the second parameter to the get_field() function like this:
Where “99” is the translated post/page ID where the custom field is assigned. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/get_field/.
Could you also try to debug it like this:
ehco "<pre>"; var_dump( get_field('previous_relationships', false, false) ); ehco "</pre>";
Also, could you please share the template file of the page so I can check it out?
If you could share the JSON or XML export file of the field group for both of the languages, that would be great too!
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