Think I'm hitting the same issue with 1.41.3
Login page loads and if I enter valid credentials it appears to login but redirects to a blank page with the path /oauth2/authorize. At a glance, it appears that headers are not being passed correctly.
We are using a comparatively simple setup: Fusionauth + Nginx in a single docker image. Our nginx config:
server {
    listen 8443 ssl;
    listen [::]:8443 ssl;
    server_name _;
    ssl_certificate /etc/ssl/certs/nginx.crt;
    ssl_certificate_key /etc/ssl/private/nginx.key;
    access_log            /var/log/nginx/access.log;
    proxy_set_header        X-Forwarded-Proto https;
    proxy_set_header        X-Forwarded-Port 8443;
    proxy_set_header        X-Forwarded-Host $host;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header        X-Forwarded-Server $host;
    proxy_set_header        X-Real-IP $remote_addr;
    proxy_set_header        Accept-Encoding "";
    location / {
        proxy_http_version 1.1;
        proxy_pass http://127.0.0.1:9011/;
    }
}