Chinese Characters Become Invisible When Moving the Cursor with Arrow Keys in Codex CLI

What version of Codex CLI is running?

0.144.5

What subscription do you have?

PRO

Which model were you using?

gpt-5.6

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What terminal emulator and version are you using (if applicable)?

Windows PowerShell

Codex doctor report

What issue are you seeing?

When entering or editing Chinese text in Codex CLI, using the left or right arrow keys to move the cursor causes some Chinese characters to turn black or become invisible against the background.

This issue occurs consistently and significantly affects Chinese text editing. Please investigate and fix it as soon as possible.

https://github.com/user-attachments/assets/77d5ccf1-4e5e-4e22-9902-2ceade4bb1d2

What steps can reproduce the bug?

1.Open Codex CLI.
2.Enter a line of Chinese text.
3.Use the left or right arrow key to move the cursor between Chinese characters.
4.Some Chinese characters turn black, become invisible, or display incorrectly after the cursor moves.

What is the expected behavior?

Chinese characters should remain clearly visible when moving the cursor with the left or right arrow keys.

Cursor movement and text editing should work correctly without changing character colors, hiding characters, or causing display issues.

Additional information

_No response_