[BUG] Plan mode scrolling broken

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?

When in plan mode, the plan is now an inner scrollable container making it impossible to scroll up to see Claude's thoughts on the last turn. I can see a couple lines of a previous reply at the top but can not scroll up. I can only scroll the plan itself.

Often when I reply to the plan, Claude will comment directly on the comments before updating and displaying the plan. I can no longer read that, effectively destroying the UX. I have to ask Claude to exit plan mode after each turn to read up.

What Should Happen?

I should be able to scroll up above the plan to see chat history

Error Messages/Logs

Steps to Reproduce

1. Enter plan mode and ask for a plan
2. Try to scroll up to the chat history

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.168 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Xterm

Additional Information

_No response_