Code formatting in "ask for approval" mode is completely broken.

What version of Codex is running?

0.20.0

Which model were you using?

gpt-5

What platform is your computer?

Darwin 24.6.0 arm64 arm

What steps can reproduce the bug?

1. Run Codex in No, ask me to approve edits and commands mode in any folder, using iTerm2 or the terminal app on a Mac
2. Ask it to implement a change to the current codebase
3. The code generated is improperly formatted and impossible to read (see image). No accept/reject prompt is visible

<img width="1512" height="894" alt="Image" src="https://github.com/user-attachments/assets/e69071af-471b-4ea1-a5c9-bd2e50e82635" />

What is the expected behavior?

_No response_

What do you see instead?

_No response_

Additional information

_No response_