[Bug] Session restore creates truncated chat history from claude agents list

Question

**Bug Description**
when sessions are in the 'claude agents' list, sometimes restoring them results in an empty chat session except for the last message. claude --resume shows 2 sessions, one the new truncated one, and the other is the good old one i can recover and resume

**Environment Info**
- Platform: darwin
- Terminal: iTerm.app
- Version: 2.1.156
- Feedback ID: 5c9a7011-9d61-478a-a51e-22512de57f93

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