Bug Report: Chinese Input Character Loss in Codex CLI

What version of Codex is running?

0.25.0

Which model were you using?

gpt-5

What platform is your computer?

Darwin 24.5.0 arm64 arm

What steps can reproduce the bug?

1. Open Codex CLI.
2. Input 4 Chinese characters in one keystroke (e.g., “测试输入”).
3. Observe that only 2 characters are displayed.
4. Continue typing more characters.
5. Observe that the missing characters appear retroactively.

What is the expected behavior?

All input Chinese characters should appear immediately without being lost or delayed.

What do you see instead?

Some characters are not shown at first (e.g., only half are displayed), but they are restored once additional typing occurs.

Additional information

Codex CLI version: 0.25.0

OS: macOS 15.5

Terminal: iTerm2

Input method: macOS built-in Chinese Pinyin IME