Copilot CLI incorrectly switches back to previous model after switching to BYOK

[doggy8088]

Describe the bug

I ran out of AIC while using claude-sonnet-4.6. After exiting GitHub Copilot and resuming my session using BYOK, the Copilot CLI automatically switched back to claude-sonnet-4.6, despite having supposedly switched to the BYOK configuration.

Affected version

No response

Steps to reproduce the behavior

1. Run out of AIC while using claude-sonnet-4.6.
2. Exit GitHub Copilot.
3. Resume session using BYOK.
4. Observe that Copilot CLI automatically switches back to claude-sonnet-4.6 or showing this:

Model 'glm-5.2:cloud' not found on provider at https://ollama.com/v1 (HTTP 404).
  Check that the model is available on your provider. 

Expected behavior

The CLI should respect the BYOK configuration and not revert to the previously used model after a session restart.

Additional context

No response