[BUG] Pasting text placeholder blinks on every Cyrillic character input

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 typing Cyrillic characters (UTF-8 multibyte, 2 bytes each), Claude Code
briefly shows a "Pasting text" placeholder and the entire status line blinks
on every single keystroke.

Environment:

• Claude Code: 2.1.76
• OS: Linux (Ubuntu, kernel 6.8.0)
• Terminal: bash

What Should Happen?

Expected: Input renders smoothly like ASCII characters
Actual: Each Cyrillic character triggers a paste event detection, causing
visible blink/placeholder

Error Messages/Logs

Root cause (hypothesis): Terminal sends multibyte UTF-8 sequences; Claude Code   detects them as bracketed paste events instead of regular keystrokes.

Steps to Reproduce

1. Set keyboard locale to Russian (or any Cyrillic input)
2. Type any Cyrillic text in the input field
3. Observe blinking on each character

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.76

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_