Bug: With ResponsesAPI in Microsoft Agent Framework ag-ui throws error "invalid_type", path: "parentMessageId"

[randomkms]

There is a similar issue for
Microsoft Agent Framework microsoft/agent-framework#2637
and CopilotKit (error comes from ag-ui library) CopilotKit/CopilotKit#2788

I will not copy-paste the description here.
I think it makes sense to fix it on both sides (backend and frontend).

[itzhoujun]

same issue