[BUG] Voice input doesn't work in plan edit mode

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 trying to modify the execution plan using the voice input feature during the planning stage, the voice transcription is not inserted into the input field.

Instead, the Claude Code UI briefly flickers: the planning interface disappears and then reappears, and no text from the voice recording is added.

This happens when selecting the option to update the plan and then starting voice recording.

Observed behavior:

1. UI briefly hides the planning interface
2. The UI then reappears
3. No transcription is inserted into the input field

<img width="923" height="735" alt="Image" src="https://github.com/user-attachments/assets/7489e90d-bb89-48a3-a8c9-c83860cc83dc" />

https://github.com/user-attachments/assets/16ab2570-f5d4-4616-b633-01497cdfc48d

What Should Happen?

Voice input should transcribe the spoken text and insert it into the input field for:

Type here to tell Claude what to change

The user should then be able to submit the change request to update the plan.

Error Messages/Logs

No explicit error message is shown

Steps to Reproduce

1. Start Claude Code in any project
2. Ask Claude to perform a task that triggers planning mode
3. Wait for the message Claude has written up a plan and is ready to execute.
4. Select option Type here to tell Claude what to change
5. Hold Space to start voice recording
6. Speak a request to modify the plan
7. Release Space to stop recording

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.70 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Voice input works normally in regular chat prompts, but fails specifically in plan editing mode.

A screenshot of the planning UI & video of bug reproduction are attached.

<img width="923" height="735" alt="Image" src="https://github.com/user-attachments/assets/7436e0dd-b9fd-430c-8d4d-bed283e0fdce" />
https://github.com/user-attachments/assets/74eb9cbb-af34-471a-88e3-85507745098d