AskUserQuestion silently resolves without displaying to user (VS Code extension)

Description

AskUserQuestion can silently resolve without the question UI ever being shown to the user. Claude then proceeds as if the user answered, even though they never saw the question.

Steps to reproduce

1. Start a Claude Code session in VS Code with plan mode active
2. Claude invokes AskUserQuestion
3. The tool returns immediately with an empty/default answer — the question UI never appears
4. Claude continues as if the user responded

Expected behavior

The question UI should appear and block until the user makes a selection.

Actual behavior

The tool resolved instantly with an empty answer: "User has answered your questions: ." (note the blank value). The user never saw the question.

Retrying the same AskUserQuestion call in the same session worked correctly on the second attempt.

Environment

• Claude Code in VS Code (native extension)
• Plan mode was active at the time
• macOS