The `--config-dir=PATH` is not working as expected

[doggy8088]

Describe the bug

Here is my situation:

1. I have a ~/.copilot/config.json.
2. I run copilot with --config-dir .copilot which I want to set ./.copilot as my primary config directory.

I found that during the execution of Copilot CLI, session data is written to the ./.copilot/ folder, but config.json reads the contents of ~/.copilot/config.json. That's so strange!

Affected version

GitHub Copilot CLI 1.0.9.

Steps to reproduce the behavior

1. Create a ~/.copilot/config.json which assign a model to gpt-5-mini.
2. Create a ./.copilot/config.json which assign a model to claude-sonnet-4.6.

Run copilot --yolo --config-dir .copilot which will load gpt-5-mini model.

Expected behavior

The command arguments should take precedence over and be higher than ~/.copilot/config.json

Additional context

No response