Bug where i cannot send messages in duplicated chats

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Bug where i cannot send messages in duplicated chats, this is in agent layout, in the version 2.4.0

Steps to Reproduce

In agent layout, duplicate a chat, and try to send a messege, nothing happens, or it doesnt send.

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.4.0-pre.10.patch.0 (Universal)
VSCode Version: 1.105.1
Commit: 08b243a087ebf466232cafe62df6027dd3e40210
Date: 2026-01-07T08:26:58.321Z
Build Type: Stable
Release Track: Nightly
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.1.0

For AI issues: which model did you use?

Opus 4.5 and codex max

Does this stop you from using Cursor

Yes - Cursor is unusable

3

Hey, thanks for the report.

This is a known issue that the team has already logged. Based on the earlier report, the bug happens when a chat is duplicated while the agent is running.

A similar issue was discussed here: Duplicated chat can't be continued

Workaround: Use the original chat instead of the duplicated one, or avoid duplicating the chat while the agent is active.

The team is working on a fix. If you find any extra details about what triggers it (like specific models or agent actions), please share them. It’ll help with debugging.