HStack, List, ForEach of VStack not working

I have the following view:

    var body: some View {
        HStack(
            alignment: .top
        ) {
            // List {
                ForEach(taskLists, id: \.self) { list in
                    VStack(alignment: .leading) {
                        TaskListView(list: list)
                            .padding(10)
                    }
                }
                .onMove { indices, newOffset in
                    print("mooooooooove")
                }
            }
        //}
    }

So, it is a horizontal stack of several VStacks. This works fine (e.g):

■ ■ ■

Now, I want to wrap ForEach with the List to enable the drag-n-drop. When I uncomment the lines in the above code, the view changes to the vertical stack of the inner VStacks, i.e. they are now one above the other:

■
■
■

How can I use List&ForEach and remain the horizontal stack AND to enable the onMove()?

Please note that putting List before HStack gives the correct view, but the method onMove is not being called.