ScrollViewProxy didn't work when i use fetched data with observed object

Test.swift

// Repository
class BasePublicChatRepository {
    @Published var publicChats = [PublicChat]()
}

// In repository, I load data from firebase. Like,
self.db.collection(self.publicChatsPath)
  .whereField(...)
  .getDocuments(completion: { (querySnapshot, error) in
      if let querySnapshot = querySnapshot {
          self.publicChats = querySnapshot.documents.compactMap { document -> PublicChat? in
              try? document.data(as: PublicChat.self)
          }
      } else {
          print("error fetching publicChats: \(String(describing: error))")
      }
  })

// ViewModel
class PublicChatListVM: ObservableObject {
    @Published var publicChatRepository: PublicChatRepository = Resolver.resolve()
    ...
    init(...) {
      publicChatRepository.$publicChats.map { publicChats in
            publicChats.map { chat in
                PublicChatCellVM(chat: chat, locationManager: locationManager)
            }
        }
      .assign(to: \.joinedPublicChatCellVMs, on: self)
        .store(in: &cancellables)
    }
}

// View
struct PublicChatListView: View {
    @ObservedObject var publicChatListVM: PublicChatListVM
    init() {
        self.publicChatListVM = PublicChatListVM()
        ...
    }
    var body: some View {
        ScrollViewReader { scrollViewProxy in
            VStack {
                Button("Scroll to top") {
                    scrollViewProxy.scrollTo(0)
                }
                
                Button("Scroll to buttom") {
                    scrollViewProxy.scrollTo(itemCount-1)
                }
                
                ScrollView {
                    LazyVStack {
                        ForEach(self.publicChatListVM.joinedPublicChatCellVMs) { publicChatCellVM in
                        ZStack {
                            CellView(publicChatCellVM: publicChatCellVM)
                            NavigationLink(...)) {
                                 EmptyView()
                            }
                            .buttonStyle(PlainButtonStyle())
                        }
                    }
                    }
                }
            }
        }
    }
}

Hey sorry for the delay.

I've decided to go with some other approaches and wait for the new swiftUI release :)