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Hi there,

This is a problem of the page builder (WPBakery Page Builder) when used with Polylang, which we have recently reported to the WPBakery team and hopefully it will be fixed in the upcoming updates:

(view large version)

Anyway I have implemented a temporary fix until WPBakery team fixes the issue, the Polylang plugin uses a WPML legacy function (like a middleware) which in combination with WPBakery function that we use: wpb_getImageBySize is causing this issue.

I have modified this file of WPBakery:

wp-content/plugins/js_composer/include/helpers/helpers.php:45

And changed:

$attach_id = apply_filters( 'wpml_object_id', $attach_id );

to 

$attach_id = apply_filters( 'wpml_object_id', $attach_id, 'attachment', true );