[BUG] The going to the first line causes to go to previous prompt bug IS BACK

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?

This bug has existed before in the past, and has regressed multiple times. I don't know what the relevant issues are, or the relevant code, but it was fixed the last time it was brought up and it's back again.

Basically, if you have multiple lines typed out, and you use the arrow key to get to the first line in your terminal of a prompt you've typed out so you can edit the beginning of it, it goes to the previous prompt you entered instead of staying on the current prompt (goes back through history).

What Should Happen?

Go to first line.

Error Messages/Logs

Steps to Reproduce

Not sure how to reproduce, hoping you remember the bug.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Not sure

Claude Code Version

2.1.20 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_