Prompt briefly shows macOS MallocStackL process text before typing

What happened?

In the Codex CLI prompt/status area, a macOS-looking process/debug string briefly appears before input begins:

codex(14488) MallocStackL

It disappears as soon as I start typing in the prompt.

Expected behavior

The prompt should not show transient process/debug text before the user starts typing.

Actual behavior

The prompt initially displays codex(<pid>) MallocStackL, then redraws/clears it once typing starts.

Environment

• Codex CLI: codex-cli 0.132.0
• OS: macOS
• Terminal: observed in an interactive Codex CLI session

Notes

This looks like leaked process/status output or a prompt redraw artifact. I do not yet have a minimal reproduction beyond seeing it in the live prompt before input.