Session Forks dont appear in editor sessions list

I created a fork in editor window here:

It shows in agent window:

But not in the editor sessions list:

...this basically breaks the fork feature.

Can we remove the concept of "chats" in ahp, model chats as session, and store session2.parent = session1, session2.type = "chat", with session2 being the chat session and session1 being the main session? A client that understands these attributes can render them nicely, a client that doesn't at least shows all sessions in a list.
This applies to both github copilot app and the editor window.