[BUG] When user prompted with suggested prompt, pushing return key fails to submit

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?

<img width="1188" height="648" alt="Image" src="https://github.com/user-attachments/assets/558638c1-ef4f-4fb7-92d4-3600b98d2112" />

Claude code will sometimes provide a proposed prompt text (e.g. "try it out"). When I push return key to accept the suggested prompt text a little character sized box with a "?" appears, overwriting the first character, and the prompt is not submitted. What I see is showing in the attached screen capture.

Pasting a prompt in (with ^C) also fails -- the same character sized box appears.

When I asked Claude Code about this, it suggested reporting it as an issue -- so I am doing that here.

What Should Happen?

The suggested prompt should be submitted when the return key is pressed.
Pasting a prompt in with ^C should cause the text from the clipboard to appear.

Error Messages/Logs

Steps to Reproduce

I don't know how to reproduce this on other systems. _

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.165 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_