[BUG] Bash tool routes all commands to background tasks that never complete

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?

Bash tool routes all commands to background tasks that never complete.
I try reinstall claudecode but not work

What Should Happen?

Claude should can execute ![os command] such as !ls !find ...

Error Messages/Logs

Steps to Reproduce

! ls
⎿  Command running in background with ID: b6muqn4kp. Output is being written to:
/private/tmp/claude-501/-Users-ipreach/bf0e07e9-d12e-4b88-b883-d892e557c3b2/tasks/b6muqn4kp.output

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code v2.1.133

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="778" height="619" alt="Image" src="https://github.com/user-attachments/assets/94822eb0-b053-4a8c-9db6-a224c5e0cf9b" />

<img width="778" height="619" alt="Image" src="https://github.com/user-attachments/assets/5f4dbc1b-5583-4ad2-8a5a-3de4c54e7915" />