WidgetConfigurationIntent @Parameter can't get value, when restart iphone.

struct ConfigurationAppIntent: WidgetConfigurationIntent {
    static var title: LocalizedStringResource = "Configuration"
    static var description = IntentDescription("Choose Server")
    @Parameter(title: "Server")
    var server :Server?
   }

struct Provider: AppIntentTimelineProvider {
    func timeline(for configuration: ConfigurationAppIntent, in context: Context) async -> Timeline<WidgetServerEntry> {
// when restart iphone , configuration all setting is lost.  
}
}

when restart iphone , configuration all setting is lost. but long tap widget and go to select param view, the value is still on last selected option.