Copilot settings are lost/changed after upgrading

**Describe the bug**

After I upgrade from 0.43.139 to 0.43.140, at least two settings are clearly lost or changed.

One, MCP settings, in another issue thread, I was suggested to disable context7 to get rid of response error. However, after the upgrading, the context7 is enabled again.

Two, model settings, I have added OpenRouter as a model provider and selected some models to use. After the upgrading, all models under OpenRouter were selected by default, over 200 models.

**Versions**
- Copilot for Xcode: 0.43.139 to 0.43.140
- Xcode: 26.0
- macOS: 26.0

**Steps to reproduce**
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**Additional context**