[Bug] Anthropic API Error: Missing reasoning_content with extended thinking enabled

Question

**Bug Description**
API Error: 400 {"error":{"type":"invalid_request_error","message":"thinking is enabled but reasoning_content is missing in assistant tool call message at index 54"},"type":"error"}

this warning always appear in claude code sessions and interrupt the main agent loop

**Environment Info**
- Platform: darwin
- Terminal: iTerm.app
- Version: 2.1.81
- Feedback ID: e0ee185e-8930-41f4-8344-f5979faaa0d2

**Errors**
```json
[]
```