Web resources transferred with the wrong MIME type

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, this is the docker compose
• Have you searched for similar issues (both open and closed)?
  • Yes, found this similar one: #284

Describe the bug When accessing a proxied server, the browser blocks some resources because of a wrong MIME type

Nginx Proxy Manager Version v2.9.19

To Reproduce Steps to reproduce the behavior: Perhaps it's an issue with custom locations:

1. Access server like hostip/service
2. inspect
3. open console There may be errors loading some resources

Expected behavior

Screenshots Console error

nextcloud, like this because it doesn't load css homeassistant, stuck here because it doesn't load js

setup screenshots: NPM, proxy host and custom locations

Operating System Raspberry pi (192.168.1.5) with raspberry OS and all the services are on docker, on the same bridge network: NPM (172.19.0.4), portainer (172.19.0.3), nextcloud (172.19.0.5) and homeassistant (172.19.0.2) of which NPM and portainer properly load, while nextcloud and homeassistant fail to load some resources

Additional context Have tried with firefox and chrome. Accessing directly works fine. NPM logs are clear, there is the browser request and the file is sent

Logs for a connection to NPM and then portainer proxy-host-6_access.log proxy-host-6_error.log

Logs for connections to nextcloud and then homeassistant proxy-host-6_access.log proxy-host-6_error.log