[BUG] ESC key corrupts input state — submitted prompt disappears, requires chaser prompt, chaser then hangs for 3+ minutes burning ~1K tokens

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?

Pressing ESC at any point during a session corrupts the input buffer state, causing a repeating cycle:

• Press ESC (to interrupt or for any reason)
• Type next prompt and submit — prompt disappears from the UI with no response
• Send a throwaway "chaser" prompt (e.g. "hi") — the original prompt now appears and Claude answers it correctly
• The chaser prompt then fires, consuming ~1,000 tokens
• Claude hangs for 3+ minutes with no visible activity
• User presses ESC to break out — and the cycle repeats from step 1

What Should Happen?

ESC interrupts cleanly. The next submitted prompt is processed normally with no input state corruption.

Error Messages/Logs

Steps to Reproduce

1. Start a Claude Code session
2. Press ESC at any point (during input, during a response, etc.)
3. Type a prompt and hit Enter
4. Observe prompt disappears with no response
5. Send any follow-up message
6. Observe original prompt processes correctly, then chaser hangs

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.59 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_