[BUG] Verbose mode not displaying thinking blocks in 2.1.42 (regression since 2.1.29)

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?

Thinking blocks are not displayed in the terminal output when verbose mode is enabled since 2.1.29. The /config menu shows "Verbose output: true", and the --verbose CLI flag is passed, but thinking blocks do not appear in the terminal during or after Claude's response.

The thinking blocks ARE being generated and recorded — they exist in the session transcript file (.jsonl). This is purely a display issue in the CLI.

What Should Happen?

When verbose mode is enabled (via /config or --verbose flag), thinking blocks should be displayed in the terminal output, as they were in v2.1.29.

Workaround:

Downgrade to v2.1.29

Error Messages/Logs

(None — no error is displayed. The thinking content is simply not shown.)

Steps to Reproduce

Install Claude Code 2.1.42
Start a session with claude --verbose
Alternatively, start claude and enable verbose via /config → "Verbose output" → true
Send a message that triggers thinking (using a thinking-enabled model like Opus)
Observe: No thinking blocks are displayed in the terminal
Verify thinking was generated: Check the session transcript file at ~/.claude/projects/{project}/{session-id}.jsonl — it contains "type":"thinking" entries

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.29

Claude Code Version

2.1.42

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

I'm creating another issue because for some reason @ashwin-ant closed the other one even though the alleged PR that would fix the problem (source is a tweet) is not released yet. I believe this issue needs to be open untill the fix is actually released.

https://github.com/anthropics/claude-code/issues/22977

<img width="955" height="557" alt="Image" src="https://github.com/user-attachments/assets/9a1937ea-528c-43db-9e62-611a5909a485" />