[BUG] ⬛ (U+2B1B) black square emoji renders incorrectly in PowerShell while other square emoji work fine

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?

Description

The ⬛ (black large square, U+2B1B) emoji renders incorrectly in Claude Code CLI output on PowerShell. Other similar emoji like 🟩 (green square) render fine.

What Should Happen?

Expected behavior

⬛ should render the same way as other square emoji (🟩, 🟥, etc.)

Error Messages/Logs

N/A

Steps to Reproduce

To reproduce

1. Run Claude Code in PowerShell
2. Have Claude output text containing ⬛
3. Observe garbled/misaligned rendering

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.92 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Environment

• Claude Code: 2.1.92
• Shell: PowerShell
• OS: Windows 11 24H2 (Build 26100.7171)