[BUG] Stale plan preview in claude desktop

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?

Desktop app on latest osx.

When claude prepares a plan it writes it to ~/.claude/plans/randomname.md

Subsequent changes to that plan via the revise plan action or instructing it directly do not change the plan in the preview pane in the desktop app. The actual file is changes and the changes are visible in the. change diffs in the conversation, but clicking on them to expand the file opens the original cached plan, never the latest ones leading to confusion and inability to provide feedback.

I assume the same thing happens to other. claude produced artifacts like random html docs or charts but that hasn't been verified or reproduced.

What Should Happen?

Every change to the plan file or anything else in the preview pane should reflect the latest state of the underlying file.

Error Messages/Logs

Steps to Reproduce

1. Start a planning session.
2. Iterate on it use revise plan etc.
3. open the plan in the pewview pane by clicking on on the porposed plan -> you will see the original first proposal, none of the later iterations are there.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.34493.1 (255293) 2026-08-21T02:05:20.000Z (claude for mac)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_