Leaky /undo

What version of Codex is running?

0.73.0

What subscription do you have?

Plus

Which model were you using?

gpt-5.1-codex-max (reasoning high, summaries auto)

What platform is your computer?

macOS

What issue are you seeing?

I interrupted the implementation using Esc, did /undo, and re-entered the question. The answer included data from the interrupted and undone implementation (i.e., the parameters that were added there).

What steps can reproduce the bug?

Uploaded thread: 019b281b-18a2-7511-b330-21804853a4f5

What is the expected behavior?

The implementation that was undone should have been forgotten.

Additional information

_No response_