[BUG] Ctrl-B cursor movement stops working after using Ctrl-R or Ctrl-G

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?

Ctrl-B (Emacs-style "move cursor backward") stops working after using Ctrl-R (history search) or Ctrl-G (open editor).

• Works fine immediately after startup
• After using Ctrl-R or Ctrl-G, Ctrl-B no longer moves the cursor backward
• Recoverable by resuming with claude -c

What Should Happen?

The Emacs-style Ctrl-B cursor movement should work consistently, regardless of what operations were performed before.

Error Messages/Logs

None (no error output, the key simply doesn't respond)

Steps to Reproduce

1. Open Terminal.app
2. Run bash --noprofile --norc
3. Run npx @anthropic-ai/claude-code@2.1.29
4. Type some text (e.g., "test")
5. Press Ctrl-B → cursor moves left (OK)
6. Press Ctrl-R to open history search, then ESC to close
7. Press Ctrl-B → no response (NG)

Note: Ctrl-G (open external editor) also triggers the same issue.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.2

Claude Code Version

2.1.29 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• Last Working Version: 2.1.2
• First Broken Version: 2.1.3 (confirmed via bisect)