We have configured the integrations from Genesys to Dialogflow CX following the documentation and we get the first response from Dialogflow CX by launching an event. The point is that no other voice requests are sent from Genesys to Dialogflow CX after this first event.
We typically use this forum to discuss questions and problems around the Genesys Cloud APIs and developer tools (e.g. our CX as Code, CLI, etc...). Your question might be better answered in the Genesys Cloud Community forum and if you are not getting help there, I would open a ticket with our Care organization.
Thanks,
John Carnell
Manager, Developer Engagement