[Bug?] Changing the docker compose file's Username and password causes a 'ER_ACCESS_DENIED_ERROR'

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
I haven't tested this extensively. But i can only get nginx proxy manager working only with the default docker-compose.yaml. I tried using a different password and

version: '3'
services:
  app:
    image: 'jc21/nginx-proxy-manager:latest'
    ports:
      - '80:80'
      - '81:81'
      - '443:443'
    environment:
      DB_MYSQL_HOST: "db"
      DB_MYSQL_PORT: 3306
     # DB_MYSQL_USER: "<changed this>" # doesn't work
      DB_MYSQL_USER: "npm"
      # DB_MYSQL_PASSWORD: "<changed this>" # doesn't work
      DB_MYSQL_PASSWORD: "npm"
      # DB_MYSQL_NAME: "<changed this>" # doesn't work
      DB_MYSQL_NAME: "npm"

    volumes:
      - ./data:/data
      - ./letsencrypt:/etc/letsencrypt
  db:
    image: 'jc21/mariadb-aria:latest'
    environment:
# Doesn't work
     # MYSQL_ROOT_PASSWORD: '<changed this>'
     # MYSQL_DATABASE: '<changed this>'
     # MYSQL_USER: '<changed this>'
     # MYSQL_PASSWORD: '<changed this>'

      MYSQL_ROOT_PASSWORD: 'npm'
      MYSQL_DATABASE: 'npm'
      MYSQL_USER: 'npm'
      MYSQL_PASSWORD: 'npm'

    volumes:
      - ./mysql:/var/lib/mysql

On a new installation:
If I try to change the Password/usernames I get a: Bad gateway when logging in with admin@example.com and changeme
docker compose logs app shows 'ER_ACCESS_DENIED_ERROR' "Access denied for user 'npm'@'172.21.0.3' (using password: YES)"

I have to use the default's for it to work.

Nginx Proxy Manager Version
v2.11.1

To Reproduce
Steps to reproduce the behavior:
copy the yaml file from above into /opt/nginxproxymanager
change the lines:

      DB_MYSQL_USER: "npm"
      DB_MYSQL_PASSWORD: "npm"
      DB_MYSQL_NAME: "npm"

      MYSQL_ROOT_PASSWORD: 'npm'
      MYSQL_DATABASE: 'npm'
      MYSQL_USER: 'npm'
      MYSQL_PASSWORD: 'npm'

run docker compose docker compose up -d

Login to localhost:81 and use admin@example.com and changeme.
shows bad gateway

docker compose logs app shows

app-1  |   code: 'ER_ACCESS_DENIED_ERROR',
app-1  |   errno: 1045,
app-1  |   sqlState: '28000',
app-1  |   sqlMessage: "Access denied for user 'npm'@'172.21.0.3' (using password: YES)",

keep the user names and password to npm -> works

Screenshots

Operating System
Ubuntu 22.04.5 x84_64

Additional context
I've tried:

1. https://github.com/NginxProxyManager/nginx-proxy-manager/issues/577
2. Deleting the ./data folder https://www.reddit.com/r/nginxproxymanager/comments/o8fer3/er_access_denied_error/
3. made sure passwords didn't have 'symbols'
4. made sure that the folders are in the right structure.

Start with the docker-compose YAML in the issue and the docker compose logs app output showing ER_ACCESS_DENIED_ERROR; compare the default credentials with the custom DB_MYSQL_* and MYSQL_* settings and the mounted ./mysql volume. Done means a fresh installation can start and log in successfully with changed database credentials instead of returning Bad Gateway.