Spring Cloud Stream with RabbitMQ Streams

I'm trying to use the "new" Streams plugin for RabbitMQ with my spring-cloud-stream project using "functional programming model".

I have set up my application.yaml like this:

spring:
  rabbitmq:
    listener:
      type: stream
    stream:
      host: ${RABBIT_HOST:localhost}
      port: ${RABBIT_PORT:5672}
      username: guest
      password: guest
      name: demo
  cloud:
    function:
      definition: testConsumer
    stream:
      rabbit:
        bindings:
          testConsumer-in-0:
            consumer:
              containerType: stream
      bindings:
        testConsumer-in-0:
          group: demo
          destination: test
        testProducer-out-0:
          destination: test

I have a @PostConstruct method that uses StreamBridge like this:

streamBridge.send("testProducer-out-0", "testing..");

And my testconsumer looks like this:

@Bean
public Consumer<Flux<String>> testConsumer() {
    return flux -> flux.doOnEach(LOGGER::info);
}

But when I start my application, I get this exception:

Caused by: com.rabbitmq.stream.StreamException: Could not get response in 10000 ms

And in the log of my RabbitMQ container I get this error:

2022-09-14 13:30:53.485574+00:00 [error] <0.32309.0> {bad_header,<<0,0,1,0,0,17,0,1>>}

If I set spring.cloud.stream.rabbit.bindings.testConsumer-in-0.consumer.containerType to direct, everything works fine.

Does anyone have an idea of why?