is there a bug with serverside subscriptions? I have this code

subscription serverSideCommentsSubscription {
  Comment(filter: {
    mutation_in: [CREATED]
  }){
    node {
      id
      event {
        id
        host {
          id
        }
        attendees {
          id
        }
      }
      user {
        id
        name
        picture
      }
    }
  }
}

But it doesnt fire on server, if I execute it in the graphcool playground it detects the changes on

Comment

any Ideas? thanks in advance.