ScrollTo in ScrollView not working as expected

Basic scrollView . When using value for scrollView.scrollTo(value,anchor:.bottom) , it scrolls . When replacing by its value "99" , it doesn t . NOt sure if this is intended or not .If not, would like to know how to use the value of the id instead of retrieving it frol the position of the element .

struct Testchat: View {
    @State private var listMessages: [MessageTest] = []
    @State private var scrolled = false

    var body: some View {
        ScrollViewReader { scrollView in
            ScrollView {
                VStack(spacing: 0) {
                    ForEach(listMessages, id: \.id) { messageInList in
                        Text(messageInList.id)
                            .onAppear {
                                if !scrolled {
                                    let value = listMessages[99].id
                                    scrollView.scrollTo("99",anchor: .bottom)
                                    scrolled = true
                                }
                            }
                    }
                }
            }
        }
        .onAppear {
            for i in 0 ..< 100 {
                let messagetest:MessageTest = .init()
                messagetest.id = i.description
                messagetest.message = i.description
                listMessages.append(messagetest)
            }
        }
    }
}

public class MessageTest: NSObject, Codable, ObservableObject {
    var message: String!
    var id: String!

    public override init() {
        message = "VOID"
        id = "VOID"
    }
}