Thumbnail not displaying on translated post

Hello,

I am using Recent Posts Widget Extended on a multi lingual site. The plugin works fine on the primary language, but on the second language, the thumbnail do not show. As I get the default placeholder template instaed of the image, I can not check wath’s wrong with the thumbnail file.

Any hint on what I can do wrong ?

Thanks

https://www.ads-software.com/plugins/recent-posts-widget-extended/