[BUG] Using something other than Mac Shell (terminal) causes notifications to spawn a terminal window

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 do something with notifications enabled, the beep comes from a newly spawn terminal window rather than the existing terminal window (using Core Shell, for example) on Mac.

What Should Happen?

It should beep in the current window.

Error Messages/Logs

N/A

Steps to Reproduce

1. Launch Claude
2. Settings - terminal notification on
3. Do work
4. Watch a new terminal spawn just for a beep (What is your purpose, to do a beep, oh my god).

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

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_