[Bug] Subagent background task output incorrectly routed to main agent session

Bug Description
Backgrounded tasks (shells) issued by subagents are reported to the main session rather than the subagent who issued it. The consequence is that the main agent suddenly takes over the work that the subagent has to do, while the subagent stays idle forever

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.140
• Feedback ID: 9c59fc85-f0b6-4739-89c8-04ac13bd8a3b

Errors

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