VS Code extension sometimes appends garbled suffix to auto-generated task titles in Chinese

What version of the IDE extension are you using?

Codex

What subscription do you have?

Plus

Which IDE are you using?

VS Code

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

In the VS Code Codex extension, auto-generated task titles sometimes end with garbled or unrelated characters when the original prompt is in Chinese.

This has happened multiple times, not just once.

Example of a generated title:
撰写第一次需求报告文档了 ؟.:omitempty

The suffix looks invalid and unrelated to the actual user request.

What steps can reproduce the bug?

I cannot guarantee a 100% stable repro, but the issue has occurred multiple times under normal use.

1. Open VS Code
2. Use the Codex extension
3. Start a new task in Chinese
4. Let Codex automatically generate the task title
5. Sometimes the generated title ends with unexpected garbled suffixes, such as:

• ؟.:omitempty
• other random punctuation / trailing fragments

What is the expected behavior?

The auto-generated task title should contain only a clean summary of the Chinese prompt, without unrelated suffixes or corrupted characters.

Additional information

_No response_