[BUG] Incorrect rendering / not cleaning up old text correctly

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've been having rendering issues like this since Claude 2.1.30 I think (but maybe 31). Teminal: WezTerm

<img width="749" height="931" alt="Image" src="https://github.com/user-attachments/assets/2e191c5f-1ea2-4951-a10f-7a49cd02d647" />

What Should Happen?

Clear old text characters correctly

Error Messages/Logs

Steps to Reproduce

Not sure

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.31

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_