[BUG] Numbered list with a fenced code block inside an item renders duplicated/partial, repeats a list number

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 the assistant outputs a numbered list where a list item contains a fenced code block followed by continuation text, the terminal
renderer (1) repeats a list number instead of incrementing — two "2." items — and (2) leaves a partial earlier render of the list in scrollback (cut
mid-sentence at a streaming chunk boundary) before re-rendering the complete list, so the block appears duplicated. Appears to be a streaming re-render +
markdown list/code-block interaction, not a content issue — the underlying message was a single correctly-numbered list.

What Should Happen?

List renders once, numbered sequentially.

Error Messages/Logs

Steps to Reproduce

1. Ask claude code in terminal to create a numbered list of steps for something that will include a fenced code block. See below for the output received that caused the issue.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.186 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Output was as follows: (note the two number "2" in the steps and the list itself generated twice.

1. Start the app:

.venv/Scripts/python app.py

1. Check /health — open http://localhost:5000/health. Expect:

{"status": "ok", "version": "v0.1.0 · edd999c"}

1. The SHA should be edd999c (your current HEAD) — not dev. If it shows dev,

the local git rev-parse fallback isn't resolving.

1. Check the footer — log in and load the dashboard (or any app page). At the

1. Start the app:

.venv/Scripts/python app.py

1. Check /health — open http://localhost:5000/health. Expect:

{"status": "ok", "version": "v0.1.0 · edd999c"}

1. The SHA should be edd999c (your current HEAD) — not dev. If it shows dev,

the local git rev-parse fallback isn't resolving.

1. Check the footer — log in and load the dashboard (or any app page). At the

bottom, centered and muted, you should see v0.1.0 · edd999c. Confirm it does
not appear on the logged-out login/landing pages (by design — footer is in the
authenticated layout only).

1. Stop the server (Ctrl+C).