Axon 5 testing command for create or update: @EventSourcingHandler not triggered

Axon Framework AF5 Milestones
1

Hi,
I am trying to create the following scenario with axon 5: I have a command which create an aggregate (yeah, still using aggregates conceptually) that create my aggregate if it does not exist (emitting AggregateCreatedEvent), followed by an AggregateUpdatedEvent. But it seems that my EventSourcingHandler is not executed, therefore, sending the AggregateCreatedEvent even when the Event has already occured before.

this is my Aggregate

@EventSourced
public class SampleAggregate {

    private UUID id;
    private boolean created;

    @EntityCreator
    protected SampleAggregate(@InjectEntityId UUID id) {
        this.id = id;
        this.created = false;
    }

    @CommandHandler
    public void createOrUpdateSampleAggregate(CreateOrUpdateSampleAggregateCommand cmd, EventAppender eventAppender) {
        if (! created) {
            eventAppender.append(new SampleAggregateCreatedEvent(cmd.getId()));
        }
        eventAppender.append(new SampleAggregateUpdatedEvent(cmd.getId()));
    }

    @EventSourcingHandler
    private void created(SampleAggregateCreatedEvent event) {
        this.created = true;
    }
}

My testcase:

class SampleAggregateTest {

    private AxonTestFixture fixture;
    private final UUID id = UUID.randomUUID();

    @BeforeEach
    void setup() {
        EventSourcingConfigurer configurer =
                EventSourcingConfigurer.create().registerEntity(
                        EventSourcedEntityModule.autodetected(UUID.class, SampleAggregate.class)
                );
        fixture = AxonTestFixture.with(configurer);
    }

    @AfterEach
    void tearDown() {
        fixture.stop();
    }

    @Test
    void createOrUpdate_whenPreExist() {
        fixture.given().events(new SampleAggregateCreatedEvent(id))
                .when().command(new CreateOrUpdateSampleAggregateCommand(id))
                .then().success().events(new SampleAggregateUpdatedEvent(id));
    }

}

I get the following error:

The published events do not match the expected events

Expected                                                |  Actual
--------------------------------------------------------|--------------------------------------------------------
be.hazeway.axon5.aggregate.SampleAggregateUpdatedEvent <|> be.hazeway.axon5.aggregate.SampleAggregateCreatedEvent
                                                       <|> be.hazeway.axon5.aggregate.SampleAggregateUpdatedEvent

org.axonframework.test.AxonAssertionError: The published events do not match the expected events

I notices that in my aggregate, the @EventSourcingHandler method was not triggered, hence the flag created was not set to true. Why was the @EventSourcingHandler method not triggered?

@Data
@AllArgsConstructor
@Event
public class SampleAggregateCreatedEvent {
    private UUID id;
}