hm before I released the nodes I tested it and for me, it worked perfectly fine.
Be aware that the node works similarly as the webhook node. So that it only listens ongoing in production mode and only for a single event when testing. So if you want to test it. You either press the “play-button” directly on the “SSE Trigger” node or on a node afterward which is connected to it. You should then see that the “SSE Trigger” node is active, as the arrows are rotating. That means it is waiting for a Server Sent Event. As soon as it receives one it will then display you the data in the UI and then stop listening again.
Here the comment about how the webhook node works: