Describe the bug

On Kotlin code with graphql subscription implementation is the bug on error handling when the Multi produce some exception. If the exception produced a some unsubscribe the Multi (BroadcastProducer) but no error broadcasted to Client and Socket connection does not closed.

I focus on Kotlin, because on clear Java all works fine.

Expected behavior

The client receive a marshaled exception and the socket connection will close by server.

Actual behavior

The software subscriber unsubscribe the Multi flow into Quarkus App and nothing more.

How to Reproduce?

For reproduce:

1. Download the simple project reproducing
2. Run it
3. Sorry, I didn't write the test, so go to the http://localhost:8080/q/dev-ui/io.quarkus.quarkus-smallrye-graphql/graphql-ui page
4. Run the subscription by evaluating the query:

subscription s{
  testSubscription
}

5. It should raise error and close the connection immediately

In technical step enoth declare:

import io.smallrye.graphql.api.Subscription
import io.smallrye.mutiny.Multi
import org.eclipse.microprofile.graphql.GraphQLApi

class TestError(errorMessage: String): RuntimeException(errorMessage)

@GraphQLApi
class TestGqlController {

    @Subscription
    fun testSubscription(): Multi<String> {

        return Multi.createFrom().failure(TestError("Something went wrong."))
    }
}

and try the query

Output of uname -a or ver

Linux ferri 6.4.6-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Mon Jul 24 20:51:12 UTC 2023 x86_64 GNU/Linux

Output of java -version

openjdk version "17.0.7" 2023-04-18 OpenJDK Runtime Environment (Red_Hat-17.0.7.0.7-4.fc38) (build 17.0.7+7) OpenJDK 64-Bit Server VM (Red_Hat-17.0.7.0.7-4.fc38) (build 17.0.7+7, mixed mode, sharing)

GraalVM version (if different from Java)

No response

Quarkus version or git rev

3.2.3.Final, 3.2.0.Final, 2.16.5.Final (I tried plural)

Build tool (ie. output of mvnw --version or gradlew --version)

------------------------------------------------------------ Gradle 8.1.1 ------------------------------------------------------------ Build time: 2023-04-21 12:31:26 UTC Revision: 1cf537a851c635c364a4214885f8b9798051175b Kotlin: 1.8.10 Groovy: 3.0.15 Ant: Apache Ant(TM) version 1.10.11 compiled on July 10 2021 JVM: 17.0.7 (Red Hat, Inc. 17.0.7+7) OS: Linux 6.4.6-200.fc38.x86_64 amd64

Additional information

No response