Hi,
We did add a check so that modules cannot display products of unpublished categories if the category id is taken from the URL of the page. It's only possible if the category used in the one selected in the "main category" of the module.
Now I checked the code there and I tried to reproduce the issue you're describing on my end but in all my tests I was able to see the products of that module with the unpublished category.
So I'm not sure what's going on. I would need a FTP access and a link to that page to be able to check on the situation and add some debug to the code.
Could you provide that along with a link to this thread via our contact form?
www.hikashop.com/support/contact-us.html
Now, a solution to circumvent that would be to create a Joomla article with the content of that category description, set that webwinkel menu item as hidden and create another menu item to display that Joomla article and then add to that Joomla article a third module to display the listing of categories where you would select that webwinkel hidden menu item.
The display would be the same, but as the page wouldn't be a category page, the system should normally consider that the category is not taken from the URL and thus use the main category of the module and not check that it is published.