Hi, I'm currently working with the grpc extension, and I've encountered the following error when executing the grpc call:

io.grpc.StatusRuntimeException: UNKNOWN: HTTP status code 200
invalid content-type: null
headers: Metadata(:status=200,grpc-status-name=OK,matched-stub-id=00e9561b-a02a-4553-bf36-6be6d397766e)
DATA-----------------------------
{
}
DATA-----------------------------

	at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:268)
	at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:249)
	at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:167)

My stub is the following one:

private final WireMockGrpcService wireMockGrpcService =
            new WireMockGrpcService(
                    new WireMock(getPort()),
                    UnaryEnvelopeRelayServiceGrpc.SERVICE_NAME
            );

    private ManagedChannel channel;
    @BeforeEach
    void init() {
        channel = ManagedChannelBuilder.forAddress("localhost", getPort()).usePlaintext().build();
        enricherClient = new EnricherClient(UnaryEnvelopeRelayServiceGrpc.newBlockingStub(channel));
    }

    @AfterEach
    void tearDown() {
        channel.shutdown();
    }

    @Test
    void should_return_failure_when_initiation_fails() {
        wireMockGrpcService.stubFor(
                method("relay")
                        .willReturn(message(Envelope.newBuilder().build())));

Any idea what could be causing this issue?