[BUG] `Ctrl+[` no longer switches to NORMAL in vi mode on Claude Code 2.1.1

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?

When I was using version 2.0.x, Ctrl+[ works just like Vim. It switches the mode from INSERT to NORMAL. Now in version 2.1.1, it doesn't work.

What Should Happen?

Pre-2.1.0 behavior.

Error Messages/Logs

Steps to Reproduce

1. Enable VI mode
2. Input <kbd>Ctrl</kbd>+<kbd>[</kbd>

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.74

Claude Code Version

2.1.1

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_