[BUG] [CRITICAL] Newline printing for every keystroke when windows is not fully opened. Claude code unusable.

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?

Whenever I use Claude Code in a non fully opened window, the view trips completely on every keystroke or when submitting.

See video for details.

Claude code version 2.0.55
OS: windows

Git bash / Powershell show same behaviour.

https://github.com/user-attachments/assets/28c81033-1ead-42ba-a142-09a8f7da80c7

What Should Happen?

It should not do this.

Error Messages/Logs

Steps to Reproduce

Use Claude Code on windows, minimize window and start typing.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.55

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_