Why does subscribing to RSocket connectionStatus() on a connected socket result in two callback calls?

Question

socket.connectionStatus().subscribe((status) => console.log("Connection status changed: ", status));

results in:

Connection status changed: Object { kind: "CONNECTED" }
Connection status changed: Object { kind: "CONNECTED" }

The documentation of connectionStatus() states:

Returns a Flowable that immediately publishes the current connection * status and thereafter updates as it changes. [...]