[BUG] Text Rendering Issues - Garbled Characters Until Selection

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?

<img width="765" height="171" alt="Image" src="https://github.com/user-attachments/assets/7c08a415-5cc7-4a23-baca-968f2b55805e" />
The new version of Claude Code frequently displays garbled/corrupted text in the output window. The text only renders correctly after selecting it with the mouse.

What Should Happen?

This significantly impacts usability as users cannot read responses without manually selecting all text.

Error Messages/Logs

Steps to Reproduce

1. Launch Claude Code (new version)
2. Execute commands or receive responses
3. Observe the output window

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.76 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_