Unexpected/unusable behavior with steering prompts and subagents with 1.0.49 version. Worked fine in 1.0.48.

### Describe the bug

I use parallel subagents a lot and with the latest version the experience has degraded a lot and has become unusable.
1. The subagents keep on running indefinitely mostly. And even if I ask the main agent to stop them or ask them to consolidate their findings they don't stop. They keep on running in loops. 1-2 hrs and even more.
2. Steering prompts also doesn't work since the turns of those agents never completes. Its like the main agent doesnt pick up new prompts from the queue as it keeps on waiting for the subagents and subagents never complete. With 1.0.48, steering was very good, it stopped current work (of main agent) and I could send important directions if I saw it deviating. With new version the steered prompts are just added to the queue and are picked up very late.
3. Explore agents work fine, general-purpose aren't working.

Evidences

### Affected version

1.0.49

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

バージョン 1.0.49 で、並列に実行される汎用サブエージェントとステアリングプロンプトを使って動作を再現し、その後 1.0.48 と比較します。汎用サブエージェントが終了しない理由と、キューに入れられたステアリングプロンプトが遅延する理由を追跡します。完了とは、サブエージェントが速やかに停止または統合され、ステアリングプロンプトが期待どおり現在の作業を中断することを意味します。

索引モデルが issue の本文から書いたものです。