Conversation rendered/duplicated multiple times in terminal (v2.1.112)

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 scrolling back in a conversation, the entire conversation (welcome banner + user message + assistant response) appears duplicated ~4 times, as if the session was loaded/rendered
repeatedly.

Steps to reproduce:

1. Start a new conversation in Claude Code CLI
2. Send a message that triggers multiple parallel tool calls (e.g., several WebFetch calls)
3. After receiving the response, scroll back in the terminal
4. The entire conversation block (including the welcome banner "Welcome back [name]!") appears repeated ~4 times

Expected behavior:
The conversation should appear once.

Actual behavior:
The full conversation (welcome screen + message + response) is rendered 4+ times consecutively in the terminal output.

Environment:

• Claude Code v2.1.112
• Windows 11 Home
• Model: Opus 4.6 (Claude Max)
• Terminal: default bash shell

What Should Happen?

The conversation should be rendered only once. Each message (user + assistant) should appear a single time when scrolling back through the terminal history.

Error Messages/Logs

No error messages. This is a visual/rendering issue only.

Steps to Reproduce

Steps to Reproduce:

1. Open Claude Code CLI on Windows
2. Start a new conversation
3. Send a message that triggers multiple parallel WebFetch tool calls (e.g., "fetch these 4 URLs and analyze them")
4. Wait for the full response to complete
5. Scroll up in the terminal to review the conversation
6. The entire conversation block (welcome banner + user message + all tool calls + response) appears duplicated ~4 times

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.112

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

The duplication includes the welcome banner ("Welcome back [name]!") repeated before each copy, suggesting the entire UI render cycle is being triggered multiple times rather than once.
The actual AI response content is correct and not affected — only the terminal display is duplicated.