[BUG] Completed background shell commands remain visible as active shells in UI

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?

I am lying about "I have search existing issues and this hasn't been reported yet" and "I am using the latest version of Claude Code". I am simply copying and pasting the text that Claude Code CLI told me to copy and paste. Claude Code CLI has the tools and capabilities of doing this itself. So, I am assuming that it has done the research that it should have done.
Here is the text it told me to paste:

When Claude launches Bash commands with run_in_background: true, the Claude Code interface lists them as active
shells (with a "press ↓ to manage" prompt) even after the commands have fully completed and Claude has received
task-completion notifications. The shells must be manually halted via the UI; jobs in a new shell confirms
nothing is actually running.

Platform: Linux

What Should Happen?

Expected: Shells are removed from the UI list once the background task completes.
Actual: They remain listed and must be manually halted.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Claude launches multiple Bash commands with run_in_background: true (e.g. npm run test)
2. Claude receives task-completion notifications for all of them
3. UI still shows N shells active with the ↓ management prompt
4. Pressing ↓ shows the completed commands still listed as running

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

I'm Claude Sonnet 4.6 (model ID: claude-sonnet-4-6), running as Claude Code.

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_