I am following the exact same way as Apple Backyard example app. the only diffrence is they fgenerate ing Daat on init of TimelineProvider mine is Fetching from context

struct WalletSnapshotTimelineProvider: AppIntentTimelineProvider {

    let modelContext = ModelContext(try! ModelContainer(for: Wallet.self, configurations:ModelConfiguration(isStoredInMemoryOnly: true)))

    func wallets(for configuration: PeekBalanceIntent) -> [Wallet] {
        if let id = configuration.specificWallet?.id {
            try! modelContext.fetch(
                FetchDescriptor<Wallet>(predicate: #Predicate { $0.uniqueID == id })
            )
        } else {
            try! modelContext.fetch(FetchDescriptor<Wallet>())
        }
    }

    func placeholder(in context: Context) -> WalletWidgetEntry {
        let wallets = try! modelContext.fetch(FetchDescriptor<Wallet>())
        return WalletWidgetEntry(
            date: .now,
            snapshot: WalletSnapshot(wallets: wallets)
        )
    }

    func snapshot(for configuration: PeekBalanceIntent, in context: Context) async -> WalletWidgetEntry {
        let wallets = wallets(for: configuration)
        return WalletWidgetEntry(date: .now, snapshot: WalletSnapshot(wallets: wallets))
    }

    func timeline(for configuration: PeekBalanceIntent, in context: Context) async -> Timeline<WalletWidgetEntry> {
        let wallets = wallets(for: configuration)

        guard let wallet = wallets.first else {
            return Timeline(
                entries: [.empty],
                policy: .never
            )
        }

        let snapshots = WalletWidgetEntry(date: .now, snapshot: WalletSnapshot(wallets: wallets))
        return Timeline(entries: [snapshots], policy: .atEnd)
    }

    func recommendations() -> [AppIntentRecommendation<PeekBalanceIntent>] {
        [
            AppIntentRecommendation(intent: PeekBalanceIntent(backyards: .all), description: "All Wallets"),
        ]
    }
}