cannot reach relay in buzz desktop client using tls

**Describe the bug**
When using a local PKI and local domain on custom ports, the Windows (0.55) GUI Buzz Client cannot connect correctly to the relay. This only works when using Caddy as a reverse proxy over TLS. Using the Buzz CLI or curl, everything works without problems.

**Steps to reproduce**
1. Go to '...'
2. Click on '...'
3. See error

**Expected behavior**
reach the relay

**Version and platform**
Find your version at the bottom of the Settings sidebar. Write "unknown" if you can't determine it.
- Buzz version: 0.55
- OS: Windows 11

**Logs / additional context**
I cannot find any log files from client.