Mode change not "sticking"

[CRidge]

Describe the bug

When I go into plan mode, plan something, and then switch back to agent mode and ask it to implement the plan, quite often I see output like:

The user wants me to start working on the plan, but plan mode is still active.

In previous versions, it just started working anyway, but in 0.0.407 it prompted me: "Do you want to change out of plan mode?", even though I had already change to agent mode.

Affected version

GitHub Copilot CLI 0.0.407.

Steps to reproduce the behavior

1. Shift+tab to start plan mode
2. Ask to plan something
3. Shift+tab to go out of plan mode
4. Say "start".
5. Get this prompt:

╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Please switch out of plan mode with Shift+Tab, then confirm you’re ready for me to implement.                                                    │
│                                                                                                                                                  │
│ ❯ 1. Ready (out of plan mode)                                                                                                                    │
│   2. Other (type your answer)                                                                                                                    │
│                                                                                                                                                  │
│ Use ↑↓ or number keys to select, Enter to confirm, Esc to cancel                                                                                 │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

Expected behavior

Work should start in agent mode.

Additional context

No response