[BUG] Bug Report: Black gaps/empty spaces appearing during streaming output

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

Environment

• Claude Code Version: 2.0.73
• OS: Windows 11
• Node.js Version: 22.11.0
• Terminals Tested:
• Warp (Windows)
• Windows Terminal
• PowerShell
• Issue Started: December 19, 2025 (morning)

Description

Large black/empty gaps appear in the middle of Claude Code responses during streaming. The content that should appear in these gaps is completely missing or not rendered.

Actual Behavior

• Large empty/black sections appear in the middle of responses
• Content appears to be missing or not rendering
• Gaps appear during streaming, not after completion
• Issue affects all content types:
• Plain text
• Bullet lists
• Code blocks
• Tables

Screenshot

<img width="1905" height="905" alt="Image" src="https://github.com/user-attachments/assets/7953c0a1-ac71-4c4f-bce0-900b50069461" />

The screenshot shows a response where lines 1-6 are visible, then a large black gap, then "Quick reference table" at the bottom - with all content in between missing.

Troubleshooting Attempted

• [x] Tested in multiple terminals (Warp, Windows Terminal, PowerShell)
• [x] Issue persists across all terminals
• [x] Issue started on Dec 19, 2025
• [x] Reinstalled Claude Code
• [x] Cleared npm cache

Submitted by: Pratik P
Date: December 19, 2025

What Should Happen?

All response content should render continuously without gaps.

Error Messages/Logs

Steps to Reproduce

1. Start a Claude Code session: claude
2. Ask any question that generates a multi-line response
3. Observe the output during streaming
4. Black gaps/empty spaces appear between content sections

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.73

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Warp

Additional Information

• This was working correctly before December 19, 2025
• No changes were made to system configuration
• Issue appears to have started after an automatic update