Which widget are you referring to? I can be that this was an old widget (based on the old widget framework), but I’m not sure. I see there is also a new redirect widget in the app store (Redirect URL using JS), did you already try this one?
Hope this helps!
It’s annoying it’s deprecated as I’ve been using it a lot as well.
An alternative is to use Nanoflow Commons, there is an action to open a URL in there that can be used to achieve the same thing.