[BUG] ExitPlanMode approval prompt re-renders/duplicates in scrollback when session is resumed after idle

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Title: ExitPlanMode approval prompt re-renders/duplicates in scrollback when session is resumed (not an explicit resume, more like an alt+tab back to the relevant terminal) after idle

What happened
After the assistant called ExitPlanMode, the approval prompt (with the "yes / yes and auto-accept / no" options, plus a partial trailing section of the plan content) appeared several times in my transcript when I returned to the session after stepping away. From the assistant's side it was called once.

Why this is a problem

• Reading the plan above becomes hard because I have to scroll past multiple copies of the same approval menu and verification bullets.
• Because the transcript looks like it changed while I was away, it's ambiguous whether the assistant did something new — at first glance it reads like an attention-grabbing poke.

Expected
ExitPlanMode renders its prompt exactly once, in place, and subsequent session resumes don't re-emit the prompt or partial plan content into scrollback.

Environment

• Claude Code CLI, plan mode
• Session was left idle and resumed some time later
• Long plan file (~200 lines) written to ~/.claude/plans/<name>.md just before the ExitPlanMode call

Repro (best guess)

1. Enter plan mode, let the assistant write a multi-section plan file and call ExitPlanMode.
2. Leave the terminal idle long enough for a screen refresh / reconnect.
3. Come back — observe duplicated approval prompt(s) and trailing plan content in scrollback.

What Should Happen?

Expected
ExitPlanMode renders its prompt exactly once, in place, and subsequent session resumes don't re-emit the prompt or partial plan content into scrollback.

Error Messages/Logs

Steps to Reproduce

Repro (best guess)

1. Enter plan mode, let the assistant write a multi-section plan file and call ExitPlanMode.
2. Leave the terminal idle long enough for a screen refresh / reconnect.
3. Come back — observe duplicated approval prompt(s) and trailing plan content in scrollback.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.116 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

Terminal: gnome-terminal
$ ps -o 'cmd=' -p $(ps -o 'ppid=' -p $$)
/usr/libexec/gnome-terminal-server