Codex CLI TUI truncates live assistant output while resume/session may contain the complete response

Summary

In interactive Codex CLI, the live TUI sometimes shows an assistant response as incomplete: the visible output stops before the required final marker [[END_OF_ANSWER]].

This appears related to live TUI rendering or message finalization rather than model/provider output, because some affected conversations later appear complete after codex resume or session reload.

Additionally, /copy may copy the previous completed assistant message instead of the currently visible truncated response.

Environment

• OS: Windows
• Codex CLI: codex-cli 0.144.1
• Node: v22.22.0
• PowerShell: 7.6.3
• Terminal tested: Windows Terminal / standalone PowerShell
• Codex installed via Node/npm shim

Reproduction Prompt

Please output 80 numbered Chinese conclusions, each 40-80 Chinese characters.
Do not write files. Do not call tools.
The final standalone line must be:
[[END_OF_ANSWER]]

Observed

• Live Codex CLI output can stop before [[END_OF_ANSWER]].
• codex --no-alt-screen still reproduced the issue.
• Windows Terminal / standalone PowerShell still reproduced the issue.
• Raw output mode still reproduced the issue.
• /copy copied the previous assistant response, not the currently visible truncated response.
• The issue happened even when there was still plenty of context left.

Expected

• The live TUI should display the complete assistant response once the turn finishes.
• /copy should copy the latest visible/current assistant response, or clearly indicate that the current response was not finalized.
• If the response is already saved in the session, the live TUI should not stop early without showing the completed output.

Already ruled out

• Not just VS Code integrated terminal.
• Not fixed by --no-alt-screen.
• Not fixed by raw output mode.
• Not caused by a local image-paste helper script.
• Not obviously caused by context exhaustion.

Screenshots

I have redacted screenshots showing:

1. Raw output mode enabled.
2. Raw output mode still missing the final marker.
3. /copy copying the previous completed message instead of the current visible response.
4. Windows Terminal / standalone PowerShell still reproducing the issue.

Local paths, user names, provider labels, and status lines were redacted before sharing. I can provide the redacted screenshots if helpful.