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claude-code - 💡(How to fix) Fix [BUG] New tab button opens split instead of tab in same group

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Error Message

Error Messages/Logs

Code Example

The editor splits horizontally and the new conversation opens in a separate editor column on the right. Dragging the new tab back to the original editor group works, but the next time "+" is clicked, the split happens again. The bug is consistently reproducible once it starts occurring.
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

<img width="271" height="123" alt="Image" src="https://github.com/user-attachments/assets/ea67aa0d-59b0-407b-bfa1-24a49b73a4b4" /> <img width="1371" height="816" alt="Image" src="https://github.com/user-attachments/assets/67ec5794-8ed6-45e5-9d6b-88700ecfba74" />

When Claude Code is open as a panel in VS Code with a certain number of conversation tabs open, clicking the "+" button (New Conversation) causes a new Claude Code panel to open in a new split editor column to the right, instead of adding a new conversation tab within the existing editor group. This behavior is reproducible and has been observed multiple times.

Environment

OS: macOS (darwin arm64) VS Code version: 1.120 Claude Code extension version: 2.1.143 Additional context

What Should Happen?

The new conversation should open as a new tab within the same editor group, not in a new split column.

Error Messages/Logs

The editor splits horizontally and the new conversation opens in a separate editor column on the right. Dragging the new tab back to the original editor group works, but the next time "+" is clicked, the split happens again. The bug is consistently reproducible once it starts occurring.

Steps to Reproduce

Open Claude Code in VS Code (single editor column, full width) Click the "+" (New Conversation) button at the right end of the Claude Code tab bar Observe: a new split editor column appears on the right with a new "Untitled" Claude Code tab

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.143

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

Last time i had 8 tabs opened when this bug happened.

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#api#embedding generation#cache error#pipeline error#runtime error

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claude-code - 💡(How to fix) Fix [BUG] New tab button opens split instead of tab in same group