Random Chinese text occasionally appears in scheduled heartbeat messages

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

26.715.31925

What subscription do you have?

Pro 20x

What platform is your computer?

Darwin 25.5.0 arm64 arm

What issue are you seeing?

Description

I’m using a scheduled task with a heartbeat in the Codex app. Occasionally, unrelated Chinese text is appended to the heartbeat output after the automation ID.

Examples:

<heartbeat> <automation_id>monitor-cc-safety-net-false-positives</automation_id> 天天啪

<heartbeat> <automation_id>monitor-cc-safety-net-false-positives</automation_id> 俺也去

The Chinese text was not included in my task prompt and does not appear to be related to the task, its output, or my project. The issue occurs intermittently rather than on every scheduled run.

Feedback ID: 019f5e6a-cc1e-76a2-aeb3-3b26cf26d1de

<img width="831" height="431" alt="Image" src="https://github.com/user-attachments/assets/67c3713f-91d5-411c-b915-e0ebfafb454d" />

What steps can reproduce the bug?

Steps to reproduce

1. Create a recurring scheduled task in the Codex app.
2. Configure the task to send heartbeat updates.
3. Let the task run across multiple scheduled executions.
4. Check the heartbeat messages.
5. Occasionally, unrelated Chinese text appears after the automation ID.

What is the expected behavior?

Expected behavior

The heartbeat message should contain only the expected heartbeat metadata and task output.

Additional information

Additional information

• Model: GPT 5.6 Terra High
• Automation ID: monitor-cc-safety-net-false-positives
• The scheduled task otherwise appears to run normally.
• The issue has occurred more than once with different Chinese text.
• A screenshot showing multiple occurrences is attached.
• I also submitted this bug through the Codex app’s feedback feature.