[BUG] renderer hangs deterministically when streaming markdown containing C++ code fences with bool keyword inside long assistant messages; reproduces on Claude Code 2.1.139 + desktop app 1.6608.2.

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?

renderer hangs deterministically when streaming markdown containing C++ code fences with bool keyword inside long assistant messages; reproduces on Claude Code 2.1.139 + desktop app 1.6608.2.

What Should Happen?

Should not crash.

Error Messages/Logs

Steps to Reproduce

See above

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.139

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_