[BUG] Random "[28~" escape characters appearing in Windows terminal

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?

Description: Characters appear randomly at intervals, even while typing. Persists across Claude Code restarts.
Platform: Windows 11 Enterprise, Shell: bash.

The Claude Code team will need to investigate the terminal/PTY handling on Windows to fix this. This isn't something
that can be worked around on your end.

What Should Happen?

Description: Characters appear randomly at intervals, even while typing. Persists across Claude Code restarts.
Platform: Windows 11 Enterprise, Shell: bash.

The Claude Code team will need to investigate the terminal/PTY handling on Windows to fix this. This isn't something
that can be worked around on your end.

Error Messages/Logs

Steps to Reproduce

Description: Characters appear randomly at intervals, even while typing. Persists across Claude Code restarts.
Platform: Windows 11 Enterprise, Shell: bash.

The Claude Code team will need to investigate the terminal/PTY handling on Windows to fix this. This isn't something
that can be worked around on your end.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

 2.1.44 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_