[BUG] cannot read past thoughts with ctrl-o

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I use ctrl-o to inspect thinking when Claude appears to be spiralling on complex tasks. I can no longer see the past thoughts to determine if Claude is stuck (needs a helpful nudge) or legitimately making progress.

What Should Happen?

Press ctrl-o and see past thoughts in thinking mode.

Error Messages/Logs

No output

Steps to Reproduce

1. Enter thinking mode
2. Give it a complex task that takes multiple steps
3. Press ctrl-o to see detailed view
4. Cannot read thoughts

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

latest

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Windows Terminal

Additional Information

_No response_