Session-list progress indicator doesn't show activity for some sessions with active background work
Description
In the session list UI, sessions show a dot/indicator next to their title that's normally supposed to reflect ongoing progress. For one of my sessions ("Database unieke nummers en FK's"), this indicator shows nothing, even though the session has genuinely active work in progress — a long-running background subagent task (dispatched via the Agent tool, still executing/waiting on its own background test suite at the time of the screenshot).
Other sessions in the same list show their indicator as expected; this one specifically does not, despite being the one with active work happening underneath it.
Steps to reproduce
- Start a session that dispatches a long-running background subagent (e.g. via the Agent tool) and then goes idle at the top level while waiting for that subagent's completion notification.
- Open the session list while the subagent is still running.
- Observe the progress indicator next to that session's title.
Expected
The indicator reflects that the session has active/ongoing work (the background subagent).
Actual
No indicator is shown for that session, even though work is genuinely in progress.
Environment
- Platform: Windows 11