We have a multisite WP installed on our company (v.5.1.2). All the subsites are password protected and use Groups (v2.8.0) and Groups Restrict Categories (v2.1.0) to manage the access. The problem detected is that some URLs are redirected (301) just before getting to the login page. The redirections send the user to different sections on the site but with the same page slug (pages have the same name).
We have two URLs
When we send to someone the URL 1, WordPress redirects the user to the URL 2.
This behavior doesn’t happen if we deactivate the Groups plugins.