MultiSites reverse proxy on subdir/path is broken #17945

I'm trying to run Matomo behing a reverse proxy. I followed the https://matomo.org/faq/how-to-install/faq_98/ , but there are still some issues left. For example, the MultiSites plugin/All websites page links are broken.

Expected Behavior

I expect the links to the websites to work. They don't. When I pick the website from the dropdown in the CoreHome, it work flawlessly.

Current Behavior

Incorrect in MultiSites:

Correct in CoreHome:

Possible Solution

Fix the urls in the MultiSites, so that they are either relative, or correctly absolute.

Steps to Reproduce (for Bugs)

1. Run matomo behind a reverse proxy with a path different that just /
2. Go to 'All Websites' (top tight)
3. Click the name of a site
4. No correct link.

Your Environment

• Matomo Version: 4.4.1
• Bitnami Docker image

nginx reverse proxy conf:

    location /matomo/ {
        resolver 127.0.0.11 valid=30s;
        set $upstream http://matomo:8100;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Referer $http_referer;
        proxy_buffering off;

        proxy_pass $upstream;

        rewrite ^/matomo/(.*)$ /$1 break;
    }

Something similar was also reported in #13627