Encounter "Sorry, an error occurred while generating a response." frequently

**Describe the bug**

**Versions**
- Copilot for Xcode: 0.43.0
- Xcode: 26.0 beta 7 (17A5305k)
- macOS: 26.0 Beta (25A5351b)

**Steps to reproduce**
1. Use agent mode
2. Normally use.
3. Encounter this issue very frequently, I had to continue many times for one prompt.

**Screenshots**

**Logs**

**Additional context**