Message queued during agent work is silently dropped when app backgrounds / phone locks (Android)

What happens

While the agent is thinking/working on a turn, the mobile client disables interruption and lets me type a message that queues (shown dimmed/italic). If I background the app or the phone locks before that turn finishes, the queued message is silently dropped — it never sends, with no indication it was lost.

Steps to reproduce

1. On the Android app, send a prompt so the agent starts working (interruption disabled).
2. While it's still working, type + submit another message → it queues (dimmed/italic, can't interrupt).
3. Background the app, or let the phone lock, before the turn completes.
4. Return to the app.

Expected

The queued message persists across backgrounding / screen lock and is delivered when the current turn frees up.

Actual

The queued message is gone — never delivered, no error or notice.

Impact

Silent loss of intended instructions during long agent turns. Easy to hit on mobile since turns can run for minutes and the screen locks on its own.

Environment

• Claude by Anthropic (Android) app v1.260625.30
• Android 16
• OnePlus 13