[BUG] Chat History Disappears After Renaming a Chat

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?

Summary
Renaming a chat causes the entire conversation history to disappear from view. The model starts the conversation as if from scratch.
Environment

Platform: Claude Desktop App for Windows 11 + Claude Web (claude.ai)
Account type: Paid (Pro/Team)
Both desktop app and web version show identical behavior — confirmed same account

What Should Happen?

Steps to Reproduce

Have a long ongoing conversation in a chat
In the chat list (left sidebar), click the three-dot menu (⋯) next to the chat name
Click the pencil (edit) icon to rename the chat
Enter a new name and confirm
Observe the chat view after renaming

Expected Behavior
The chat history remains fully visible and accessible after renaming.
Actual Behavior

The entire chat history disappears from view
The model responds as if starting a new conversation with no prior context
When asked, the model confirms it cannot see the full history — only a very brief summary (approximately 10 words) of the previous conversation
The model is unable to restore or display the lost history

Impact

Critical data loss from the user perspective
Long conversations with important context become inaccessible
Affects paid subscribers who rely on conversation continuity
No workaround found — refreshing, restarting the app, and switching to web version do not restore the history

Error Messages/Logs

No any logs. I don't know (the system did not show any error messages).

Steps to Reproduce

Steps to Reproduce

Have a long ongoing conversation in a chat
In the chat list (left sidebar), click the three-dot menu (⋯) next to the chat name
Click the pencil (edit) icon to rename the chat
Enter a new name and confirm
Observe the chat view after renaming

Expected Behavior
The chat history remains fully visible and accessible after renaming.
Actual Behavior

The entire chat history disappears from view
The model responds as if starting a new conversation with no prior context
When asked, the model confirms it cannot see the full history — only a very brief summary (approximately 10 words) of the previous conversation
The model is unable to restore or display the lost history

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

4.6

Claude Code Version

4.6

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

<img width="1921" height="1027" alt="Image" src="https://github.com/user-attachments/assets/b2d8a72b-3d7a-4354-aa63-78385b63edd8" />

********
This message (screenshot) appears from time to time, but I don't remember if I saw it at the time the chat conversation disappeared after it was renamed.
********