Codex panicked while editing

What version of Codex is running?

codex-cli 0.20.0

Which model were you using?

gpt-5

What platform is your computer?

Linux 6.11.0-1018-azure x86_64 x86_64

What steps can reproduce the bug?

Codex was applying edits and it panicked. See screenshot for error message

What is the expected behavior?

Edit succeeds

What do you see instead?

<img width="733" height="124" alt="Image" src="https://github.com/user-attachments/assets/7a595e26-d47f-4fc6-8d96-dc58ce84240d" />

Additional information

_No response_