[BUG] Test getting cut off in Claude Code Web

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?

I can't paste more than eight lines of text into Claude Code in the web browser without it getting cut off.

What Should Happen?

I should be able to past up to the token limit into the text window.

Error Messages/Logs

Steps to Reproduce

Paste more than eight lines of text into Claude Code in fire fox on a windows machine.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

claude-sonnet-4-6

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

This has drained hours of my time. You should be paying me not vice versa.