View Update Failure

Hello,

The appearance of one of my buttons is not updating after being tapped. I have had no trouble doing the exact same thing in my other views, but here it simply doesn't work. The "heart" button will keep its original appearance (in this case an unfilled heart) no matter what, despite my print statements indicating that the value has changed. The other actions performed when tapping the heart work perfectly. I've been at it for hours.

Any help would be appreciated. Thanks!

import SwiftUI

struct SearchView: View {
    @State private var searchText = ""
    @StateObject var save = SaveWords()
    @State var heart: String?
    @State var disappear = false
    @State var done = true

    var body: some View {
        NavigationView {
            VStack {
                if !disappear {
                    SearchBarView(text: $searchText)
                    Spacer()
                }
                if searchText != "" {
                    List(.constant(Array(FetchWord.getWordFromStart(start: searchText)).prefix(10).map {Word(word: $0.1)})) { suggestion in
                        NavigationLink(destination: suggestion.IPA.wrappedValue == "error" ?  AnyView(EmptyView()) : AnyView(PracticeView(wordSheet: suggestion)
                            .onAppear {
                                disappear = true
                                if done {
                                    SaveWords.file = "Favorites"
                                    DispatchQueue.main.async {
                                        Task {
                                            try? await save.load()
                                            heart = save.words.contains(suggestion.wrappedValue) ? ".fill" : ""
                                        }
                                    }
                                }
                            }
                            .onDisappear {
                                disappear = false
                                Task {
                                    SaveWords.file = "History"
                                    try? await save.load()
                                    if save.words.first != suggestion.wrappedValue {
                                        save.words.insert(suggestion.wrappedValue, at: 0)
                                        try? await save.save()
                                    }
                                }
                            }
                            .toolbar {
                                ToolbarItem(placement: .navigationBarTrailing) {
                                    Button(action: {
                                        SaveWords.file = "Favorites"
                                        done = false
                                        if heart == "" {
                                            heart = ".fill"
                                            DispatchQueue.main.async {
                                                Task {
                                                    try? await save.load()
                                                    if !save.words.contains(suggestion.wrappedValue) {
                                                        save.words.insert(suggestion.wrappedValue, at: 0)
                                                        try? await save.save()
                                                    }
                                                }
                                            }
                                        } else {
                                            heart = ""
                                            DispatchQueue.main.async {
                                                Task {
                                                    try? await save.load()
                                                    try? await save.delete(wordToDelete: suggestion.wrappedValue)
                                                    try? await save.save()
                                                }
                                            }
                                        }
                                        done = true
                                    }, label: {
                                        Image(systemName: "heart" + (heart ?? ""))
                                    })
                                }
                            })
                        ) {
                            if suggestion.IPA.wrappedValue != "error" {
                                CardView(wordSheet: suggestion)
                            }
                        }
                    }
                }
                
            }
            Spacer()
        }
    }
}

#Preview {
    SearchView()
}