AshGraphql Subscription - Why does the data do not show up on subscribe?

The subscription is a Phoenix Subscription. So it is not a normal Websocket GraphQL subscription which is compatible with Apollo or Relay GraphQL.

When I add some roundtrips around on the setup it works - still looks like that sometimes the connection breaks.

JS Workaround with Roundtrip

How can I change the Ash Absinthe code, so that it is a standard Apollo or Relay Subscription?