Location directive ( location /{ ) causing proxy host to land at openresty landing page

Checklist

• Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image?
  • Yes
• Are you sure you're not using someone else's docker image?
  • Yes
• Have you searched for similar issues (both open and closed)?
  • Yes

Describe the bug
When working under the Advanced tab of Edit Proxy Host I place the following addition to the config dialogue box

location / {
   proxy_set_header Host $http_host;
   proxy_set_header X-Forwarded-Host $http_host;
   proxy_set_header X-Forwarded-Port $server_port;
   proxy_set_header X-Forwarded-Proto $scheme;
   proxy_set_header X-Forwarded-For $remote_addr;
}

When this is added my sites redirects me to this screen

I have also tried to use =/ in front of the location directive but none of my changes appear to register. Also tried to add this configuration in the Custom locations tab but this shuts down the proxy host.

Adding the lines directly to the proxy_host .conf file causes the proxy_host to go offline.

Nginx Proxy Manager Version
2.11.1

Expected behavior
For the headers to be applied to the location directive without redirecting traffic to the openresty page.

Screenshots

Operating System
Debian 12 Bookworm

Additional context
I am trying run danbooru, the SSL certificate is DNS challenged by cloudflare

Docker Engine - Community
 Version:           26.0.0
 API version:       1.45
 Go version:        go1.21.8
 Git commit:        2ae903e

Start by reproducing the behavior with the nginx-proxy-manager:latest Docker image and the configuration shown in the Advanced tab. Inspect the generated proxy_host .conf file and compare it with the Custom locations configuration. Done means the forwarded headers apply without sending traffic to the OpenResty landing page or taking the proxy host offline.