Codex Desktop silently reverts an 11th pinned Chat without showing the 10-chat limit

What version of the Codex App are you using (From “About Codex” dialog)?

26.721.41059

What subscription do you have?

ChatGPT Plus

What platform is your computer?

Windows 11

Microsoft Windows NT 10.0.26200.0 x64

macOS 26.0

Darwin 25.0.0 arm64 arm

The issue is reproducible on both platforms using Codex Desktop version 26.721.41059.

What issue are you seeing?

This issue affects regular Chat conversations, not Work conversations.

When 10 Chat conversations are already pinned, attempting to pin an additional Chat appears to succeed temporarily:

1. The Chat moves into the pinned section.
2. Approximately one to two seconds later, it automatically returns to the regular Chat list.
3. No error message, warning, dialog, or toast explains why the operation failed.

Because the application provides no explanation, the behavior appears to be a network, synchronization, or application problem rather than an intentional limit.

There is no error message to include because Codex Desktop does not display one.

What steps can reproduce the bug?

1. Open Codex Desktop.
2. Make sure that 10 regular Chat conversations are already pinned.
3. Select another regular Chat conversation that is not pinned.
4. Open the conversation menu and select Pin.
5. Observe that the conversation moves into the pinned section.
6. Wait approximately one to two seconds.
7. Observe that the conversation automatically returns to the regular Chat list.
8. Observe that no warning, error message, dialog, or toast is displayed.

The behavior is reproducible on:

• Windows 11: Microsoft Windows NT 10.0.26200.0 x64
• macOS 26.0: Darwin 25.0.0 arm64 arm
• Codex Desktop version on both devices: 26.721.41059

No code snippet is applicable because this is a Codex Desktop UI interaction issue.

• Session ID: Not applicable
• Token limit usage: Not applicable
• Context window usage: Not applicable

What is the expected behavior?

When the maximum of 10 pinned Chat conversations has been reached, Codex Desktop should reject the operation immediately and clearly explain why.

For example:

You can pin up to 10 Chats. Unpin an existing Chat before pinning another one.

The conversation should not temporarily appear in the pinned section when the operation cannot succeed.

Alternatively, the Pin action could be disabled after the limit is reached, with a tooltip explaining the limit.

Additional information

I initially thought that the failure was caused by a network or synchronization problem. I retried the operation several times and tested it again the following day, but the same behavior continued.

I later performed the same action in the ChatGPT web version. The web version correctly displayed a message explaining that no more than 10 conversations can be pinned.

Codex Desktop should provide equivalent feedback instead of temporarily displaying a successful state and then silently reverting the operation.