Spring-ai When the function call is used together with RAG, the function call does not work.

`@Service public class OllamaRAGServiceImpl implements OllamaRAGService {

@Autowired
private OllamaChatModel chatModel;
@Autowired
private VectorStore vectorStore;

@Value("${spring.ai.default-system.message}")
private String defaultSystemMessage;

private ChatClient chatClient;

@PostConstruct
private void buildChatClient() {
    this.chatClient = ChatClient.builder(chatModel)
            .defaultSystem(defaultSystemMessage)
            .defaultAdvisors(
                    new MessageChatMemoryAdvisor(new InMemoryChatMemory()),
                    new QuestionAnswerAdvisor(vectorStore, SearchRequest.defaults()),
                    new SimpleLoggerAdvisor())
            .defaultFunctions("getPolicyInfo") // FUNCTION CALLING
            .build();
}

@Override
public Flux<String> retrieveWithStream(String request, String conversationId) {
    return this.chatClient
            .prompt()
            .user(request)
            .advisors(a -> a
                    .param(CHAT_MEMORY_CONVERSATION_ID_KEY, conversationId)
                    .param(CHAT_MEMORY_RETRIEVE_SIZE_KEY, 10))
            .stream()
            .content();
}

@Override
public String retrieve(String request, String conversationId) {
    return this.chatClient
            .prompt()
            .user(request)
            .advisors(a -> a
                    .param(CHAT_MEMORY_CONVERSATION_ID_KEY, conversationId)
                    .param(CHAT_MEMORY_RETRIEVE_SIZE_KEY, 10))
            .call()
            .content();
}

}`

When I remove the QuestionAnswerAdvisor, the function can be called normally, but after configuring RAG and the function call, RAG can work normally, but the function call does not work.