I know how to fixed:
When u create a new site modul with PB he open a new window. Here u make ure settings for the module.
Then saved it, exit and back to admin.
In the first window you must close the module. Very important.
If u save the module, u cant never again edit it. Always 404.
So i kow hoe to help me for the moment. But change this in your next update.
But check a another problem with the site module "weitere FAQ's".
please see https://www.polymersynthese.com/home/faqs/masterbatch
In the site modul is a addon "Newsticker"
It looks perfect. In preview looks perfect.
If i save the site modul it is also fine on the website.
Until i clear the browser cache.
Then all articles of the selected category on one page.
access is open