[BUG] Messages typed during "Thinking/Deliberating/Manifesting" state aren't delivered until user hits Escape

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 Claude is mid-turn (showing "Thinking", "Deliberating", "Manifesting", etc.), new user messages typed into the input box are not delivered to Claude until the user manually interrupts with Escape. This happens even when the new message is short and Claude's current turn has no background tasks. The only reliable way to get Claude to see a new message mid-turn is to interrupt the current turn.

What Should Happen?

New messages typed mid-turn should be queued and processed as the next turn automatically, without requiring the user to manually interrupt. The UI should ideally acknowledge the queued message visibly.

Error Messages/Logs

Steps to Reproduce

Send a message to Claude that will trigger a multi-step response (tool calls, chained thinking).
While Claude is still generating (UI shows "Thinking…" / "Deliberating…" / "Manifesting…"), type and submit a new message.
Observe: Claude continues its existing turn and does not acknowledge the new message.
Hit Escape to interrupt. Claude then receives the message (and the session injects a <system-reminder> saying "The user sent a new message while you were working").

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.112 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_