[BUG] window and panel not showing same conversation the same way

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?

Taken from the extension page. I've never used the CLI before so using this for the version:

Identifier: anthropic.claude-code
Version: 2.1.49

When I use command >Claude Code: Open in New Window or >Claude Code: Open in New Tab and open a long conversation, I get the head of it (a couple of prompts with responses). When I use command >Claude Code: Open in Side Bar and open the same conversation I get the tail of it (not sure how much of the head is missing, but there is a lot of the tail shown).

I can appreciate not rendering the entire conversation as it takes up memory to do so, but it would be great if I could search through the conversation that is currently visible. Virtual scrolling would be a nice to have too, but not my current issue.

Here are some screenshots. You can see just how much conversation is shown by looking at the size of the scrollbar of each.

Head:

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/17920a39-e8dd-44a7-b63a-8d143c9cf73c" />

Tail:

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/8a7f289e-6f1b-4c94-91f2-6a9c14425c24" />

What Should Happen?

As a view, it should display the same information.

Error Messages/Logs

When opening conversation from window:

2026-03-08 12:39:28.088 [info] Received message from webview: {"type":"request","requestId":"91hsb9r0bg","request":{"type":"list_sessions_request"}}
2026-03-08 12:39:28.099 [info] Received message from webview: {"type":"request","requestId":"jhe7sykkty","request":{"type":"list_remote_sessions"}}
2026-03-08 12:39:28.100 [info] OAuth tokens found in secure storage
2026-03-08 12:39:28.230 [error] Error fetching remote sessions: AxiosError: Request failed with status code 404
2026-03-08 12:39:31.341 [info] Received message from webview: {"type":"request","requestId":"7kyiiysuh","request":{"type":"rename_tab","title":"How are you with phisics?","hasPendingPermissions":false,"hasUnseenCompletion":false}}
2026-03-08 12:39:31.341 [info] Received message from webview: {"type":"request","requestId":"j1ca4gcuwn","request":{"type":"get_session_request","sessionId":"a87437a4-763b-4655-b959-664f72703df7"}}


When opening from side bar:

2026-03-08 12:38:18.349 [info] Received message from webview: {"type":"request","requestId":"u3g9y4wi3ln","request":{"type":"list_sessions_request"}}
2026-03-08 12:38:18.360 [info] Received message from webview: {"type":"request","requestId":"hu3gux3itv","request":{"type":"list_remote_sessions"}}
2026-03-08 12:38:18.361 [info] OAuth tokens found in secure storage
2026-03-08 12:38:18.495 [error] Error fetching remote sessions: AxiosError: Request failed with status code 404
2026-03-08 12:38:21.819 [info] Received message from webview: {"type":"request","requestId":"9ruvazxiwla","request":{"type":"get_session_request","sessionId":"a87437a4-763b-4655-b959-664f72703df7"}}

Steps to Reproduce

1. Have a long conversation with Claude in the side bar till the head of the conversation falls off.
2. Open Claude in a Window (New or Tab) and open the same conversation.
3. Note the loss of the tail.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.49

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_