MessageRoutingCallback and Routing-expression not worked for event routing

Describe the issue
MessageRoutingCallback or Routing-expression not routing the message to appropriate functions.

Routingfunction responsible for routing the events to the desired function and there were two ways that we tried

1. By implementing MessageRoutingCallback. It's expected to go to anotherConsumeMessage function if headers consist of the key with the desired value. But it didn't route to the expected function rather it's routed to 'consumeMessage'.

PFB the code

 @Bean
  public MessageRoutingCallback customRouter() {
    return new MessageRoutingCallback() {
      @Override
      public FunctionRoutingResult routingResult(Message<?> message) {
        if (!ObjectUtils.isEmpty(message.getHeaders().get("test-key")) &&
            message.getHeaders().get("test-key").toString().equalsIgnoreCase("consume")) {
          return new FunctionRoutingResult("consumeMessage");
        } else if (!ObjectUtils.isEmpty(message.getHeaders().get("test-key")) &&
            message.getHeaders().get("test-key").toString().equalsIgnoreCase("anotherConsume")) {
          return new FunctionRoutingResult("anotherConsumeMessage");
        }
        return MessageRoutingCallback.super.routingResult(message);
      }
    };
  }

2. We also tried routing expression as can be seen in the below configuration but instead of anotherConsumeMessage, the message routed to ConsumeMessage. PFB the screenshot to check the content of the message and headers picked up by Kafka binder.

spring:
  cloud:
    stream:
      default-binder: kafka
      kafka:
        binder:
          auto-create-topics: false
          brokers:
            - localhost:29092
          header-mapper-bean-name: kafkaheaderMapperTest
          consumer-properties:
            value.deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
      bindings:
        consumeMessage-in-0:
          destination: test-kafka-topic
          group: groupIdConfig
        anotherConsumeMessage-in-0:
          destination: test-kafka-topic
          group: groupIdConfig
    function:
      definition: consumeMessage; anotherConsumeMessage
      routing-expression: "headers['contentType'] == 'application/json' ? 'anotherConsumeMessage' : 'consumeMessage'"
      configuration:
  application:
    name: KafkaStreams

Version of the framework

1. Spring-Cloud-Stream - 3.2.4
2. spring-cloud-stream-binder-kafka - 3.2.4
   Expected behavior
   Routingfunction should be picked and should decide the routing of the event to the desired function.
   Screenshots
   You can see the below logs to check the activity that happened on the consumer side and the message details received.

Start with the MessageRoutingCallback and routing-expression configuration shown in the issue, then inspect how the Kafka binder maps headers and selects functions for the two bindings. Reproduce the case with the provided consumeMessage and anotherConsumeMessage functions; done means each header or expression result routes the event to the expected function.