I miss something about Coroutine, it return Unit instead of my MutableList and I got this inside my logs:

java.lang.IllegalStateException: Job StandaloneCoroutine{Completed}@6daf38a4 is already complete, but is being completed with kotlin.Unit]]`

When calling:

suspend fun getValidNextEvent(node: Node, messageBody: MessageBody): MutableList<Event<MessageBody>> {

        return suspendCoroutineOrReturn { cont ->
            val eventsToEmit = mutableListOf<Event<MessageBody>>()
....
            cont.resume(eventsToEmit);
        }

    }

Сan you reproduce the problem with some reasonably-size self-contained code?

no I restarted Intellij its ok now 😉