I have a Joomla 4.1 site running the latest version of Securitycheck Pro (3.4.4). The site uses a Helix Framework template and SP Pagebuilder 3.85.
SP Page Builder has a Frontend Editor feature which allows admins to login to the frontend and edit content pages directly. To do so, in SP Page Builder you would click on "Pages" and see a list of the pages created in SP Pagebuilder. Next to each page title is a "Frontend Editor" button. Clicking it normally opens a login page in the public site.
After enabling Securitycheck Pro, when clicking the Frontend Editor button, we now go to a 404 error page with a URL structure like this: