bbPress "Recent topics" widget only in WPML default language

I'm having an issue with bbPress forums plugin and WPML. The problem is that their "Recent topics" widget is displaying in WPML's default language, but not in other languages.
This happens in the footer widget zone, and in sidebars.
Other bbPress widgets are working in all languages.
If I switch the default language, the widget is shown in the new default language, but not in the others.

I already posted a question at bbPress forums, but no answers yet...
https://bbpress.org/forums/topic/recent-topics-widget-only-in-wpml-default-language/

One problem; currently the site is not "live", nobody can see it before it's official launch.

Can you help?