[BUG] Randomly colored / code highlighted text

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 really don't get it how this issue can exist now for what feels like forever.
Sometimes, for a short while, it seems to be fine. And then I look at the terminal, either on some random output or at a plan, and I see this mess. Well, actually, this time it doesn't look as awful as sometimes it is still almost readable. Often it is not because if a plan consists of all different colors.

<img width="1640" height="1194" alt="Image" src="https://github.com/user-attachments/assets/d0ad9d03-77ce-4331-a334-47be7ae5d246" />

this is an slightly older screenshot from yesterday, showing the total mess. reading the plan is pretty much impossible.

<img width="1638" height="1160" alt="Image" src="https://github.com/user-attachments/assets/1a5742d5-eefd-4cdc-a014-ae1d6cf0684e" />

Looking on an up-to-date Windows 11 computer in a PowerShell 7 terminal on the latest Claude Code version.
(v2.1.29)

What Should Happen?

Just showed correctly as you did in earlier versions.

Error Messages/Logs

Steps to Reproduce

Go to one of my codebases, open up Claude Code, start working with it. Sometimes the first answer is already wrong, like in the first screenshot.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

i dont now

Claude Code Version

v2.1.29

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_