Strange HSTS configuration

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 testing the SSL with online tools I'm getting neggative points for the HSTS configuration. Online tools used:

• https://www.ssllabs.com/index.html

• https://developer.mozilla.org/en-US/observatory/

Strange HSTS configuration. W

Nginx Proxy Manager Version
v2.12.3 © 2024 jc21.com. Theme by Tabler

To Reproduce
Steps to reproduce the behavior:

1. Set up a proxy host

2. test your website with the tools mentioned above
3. See error

Expected behavior
Enabling HSTS should not give an "Server sent invalid HSTS policy." error.

Operating System
TrueNAS SCALE 25.04 Fangtooth
Linux Kernel 6.12.15
Docker Engine 27.5.0

Start by reproducing the issue with the proxy host and SSL settings described, then inspect the HSTS response using SSL Labs or Mozilla Observatory. Trace where Nginx Proxy Manager generates the HSTS configuration and verify the resulting policy against the reported invalid-policy error. Done means enabling HSTS produces a valid policy in both tools.