[BUG] Black tab switching when claude cowork is being used

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 write a message in a project under cowork, claude app on mac switches tabs to a black tab and then returns back to desktop. The black tab is nowhere to be found. I click on claude again to continue working. Happens every time I write something in the chat and send. It also 'prepares session' for a couple minutes after every message I send before it actually replies.
I cleared cache and restarted the app. As soon as the app opened up, black tab appeared and disappeared again.

What Should Happen?

I need help!

Error Messages/Logs

Steps to Reproduce

I don't know yet..

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code v1.8555.2

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_