custom location causes ERR_TOO_MANY_REDIRECTS

Issue:
using a custom location introduces a ERR_TOO_MANY_REDIRECTS error on my application (which works fine if I use the main forward host without location).

Context (optional):

• Trilium web server docker image
• Nginx proxy manager forwards to the docker container name "trilium" over HTTP
• There is no HTTPS involved whatsoever in my current setup
• All advanced configs in NPM are empty
• The custom location and main location settings in NPM for trilium are identical
• The custom location for "dummy-docker" is working just fine
• connecting Trilium to 192.168.1.52 works
• connecting Trilium to 192.168.1.52/trilium does not work

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

Nginx Proxy Manager Version

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

Screenshots

Operating System

Additional context

No source file or test is identified. Start by reproducing the difference between the main host and the /trilium custom location using the stated Docker and Nginx Proxy Manager setup, then compare the resulting behavior and available proxy details. Done means the custom location loads without ERR_TOO_MANY_REDIRECTS and the cause is verified.