[BUG] Cowork desktop: session switch during mid-generation lands at random mid-point instead of bottom

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 switching between Cowork sessions on Claude Desktop while one is actively mid-generation, the conversation view for the session being opened lands at a random mid-point in the scroll history instead of at the bottom. The most recent messages are off-screen and require a manual scroll to reach. No "jump to bottom" button is presented by the UI.

This appears to be the same class of bug that was fixed for the VSCode extension in a recent release ("VSCode: Fixed scroll-to-bottom under-scrolling on initial session load and session switch"), just on a different client surface.

What Should Happen?

Switching into a Cowork session should land the scroll position at the bottom of the conversation, matching the behavior of Chat mode and the now-fixed VSCode extension.

Error Messages/Logs

Steps to Reproduce

Open Claude Desktop in Cowork mode
Start a generation in one Cowork session
While that generation is still in progress, switch to another existing Cowork session with enough history to require scrolling
Observe the scroll position on load — lands at a random mid-point rather than the bottom

Frequency: Reproduces on session switch when a session is mid-generation. Not observed on idle-to-idle switches so far. More noticeable on longer conversations because the distance from the landing point to the bottom is larger.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.3883.0 (93ff6c) 2026-04-21T17:24:01.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_