(oops! I tried to reply to my post, and replaced it instead - sorry.)

Okay, well, ahem.

I got this to work with a List. Which I always understood would not work, that you would have to use ForEach. By using a List, I get access to the Hierachical sidebar list that I need.

The issue was my Model data class (Sidebar) gave it indigestion. There were NO error messages, there was NO crash. It simply hung. No memory leaks, I could find no where to place a breakpoint - it was basically off comtemplating it's navel.

To fix it I finally, fixed it by dragging only the sidebar.id (a uuidString) and then in the destination, doing a "if let sidebar = sidebars.first(where: {$0.id == items[0]}) { print(sidebar.title) }"

Here is my List for those that might be struggling with doing this:

                    List(sidebars.sorted{$0.index < $1.index}[0].children!, id:\.id, children: \.children, selection: $selected) { sidebar in
                        NavigationLink {
                            SidebarDetailSelectorView(sidebar: sidebar)
                        } label: {
                            rowLabel(sidebar: sidebar)
                            //.background(Color.random())
                        }
                        .onChange(of: selected) {
                            current.sidebar = sidebars.first{ $0.id == selected }
                        }
                        .draggable(sidebar.id)
                        .dropDestination(for: UUID.self) { items, location in
                            if let sidebar = sidebars.first(where: {$0.id == items[0]}) {
                                print(sidebar.title)
                                // do magic here...
                            }
                            return true
                        } isTargeted: { isTargeted in
                            sidebar.isTargeted = isTargeted
                        }
                    }