Codex CLI Input Box Style Changes Automatically After Long-Running Session on Windows

What version of Codex CLI is running?

v0.134.0.

What subscription do you have?

ChatGPT Plus

Which model were you using?

gpt-5.5

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

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

Windows Terminal with PowerShell

Codex doctor report

What issue are you seeing?

On Windows, after a Codex CLI session has been running for a while, the input box/prompt area automatically changes into an abnormal style, as shown in the attached screenshot.

The issue appears during a long-running session. I am not sure what exact action triggers it. The input box UI becomes visually corrupted or changes unexpectedly.

Codex CLI version: v0.134.0

What steps can reproduce the bug?

1. Open Codex CLI on Windows.
2. Start or continue a conversation.
3. Keep using the same session for a while.
4. Observe the input box/prompt area.
5. After some time, the input box style changes unexpectedly, matching the attached screenshot.

What is the expected behavior?

Expected behavior:
The input box should keep its normal style throughout the session.

Actual behavior:
The input box style changes automatically after the session has been running for some time.

Additional information

<img width="389" height="56" alt="Image" src="https://github.com/user-attachments/assets/7e571fe5-7644-4430-81cd-ff941f9e8661" />