Bot Framework V4中的同义词不再起作用

Question

Bot框架中的同义词功能无法正常工作。在下面的代码行中，如果使用情况输入了新的/新的案例，则应得出value =“ Create new case”。到目前为止，只有创建新案例会进入正确的对话框，而新案例/新案例会导致漫游器无法理解用户的需求。

private static async Task<DialogTurnResult> ChoiceCardStepAsync(WaterfallStepContext step, CancellationToken cancellationToken)
        {
            // Create options for the prompt
            Activity activity = step.Context.Activity;
            var options = new PromptOptions()
            {
                Prompt = activity.CreateReply("What would you like to do?"),
                Choices = new List<Choice>(),
            };


            // Add the choices for the prompt.
            options.Choices.Add(new Choice() { Value = "Check case status" , Synonyms = new List<string> { "status", "case status", "check case" }});
            options.Choices.Add(new Choice() { Value = "Create new case" , Synonyms = new List<string> { "new", "new case" } });
            options.Choices.Add(new Choice() { Value = "Look for an agent" });
            options.Choices.Add(new Choice() { Value = "End Conversation" });

            return await step.PromptAsync("cardPrompt", options, cancellationToken);
        }



`WaterfallStep[] steps = new WaterfallStep[]
            {
                ChoiceCardStepAsync,
                HandleChoiceAsync,
                LoopBackAsync,
            }

        _dialogs = new DialogSet(_accessors.DialogStateAccessor)
            .Add(new WaterfallDialog(MainDialogId, steps))
            .Add(new CheckCaseStatusDialog(CheckCaseStatusDialogId))
            .Add(new NewCaseDialog(NewCaseDialogId))
            .Add(new ChoicePrompt("cardPrompt") {Style = ListStyle.SuggestedAction });`

我已经检查了Microsoft文档，并且仍可用于bot框架V4，但是我不确定为什么它没有效果。任何人都可以启发我了解我所缺少的东西吗？