fix: resolve im backend issue list regressions

server/session.go

@@ -756,7 +756,7 @@ func (s *Session) subscribe(msg *ClientComMessage) {
 	// client complete the alias->canonical rename with a 200 reply instead of
 	// a 304 that would leave the client-side alias topic object unattached
 	// (publishes on it then fail with "Cannot publish on inactive topic").
-	if sub := s.getSub(msg.RcptTo); sub != nil && msg.Original == msg.RcptTo {
+	if sub := s.getSub(msg.RcptTo); sub != nil && canReplyAlreadySubscribed(msg.Original, msg.RcptTo) {
 		s.queueOut(InfoAlreadySubscribed(msg.Id, msg.Original, msg.Timestamp))
 		s.inflightReqs.Done()
 	} else {
@@ -772,6 +772,18 @@ func (s *Session) subscribe(msg *ClientComMessage) {
 	}
 }
 
+func canReplyAlreadySubscribed(original, routeTo string) bool {
+	if original == routeTo {
+		return true
+	}
+	switch original {
+	case "me", "fnd", "slf":
+		return true
+	default:
+		return false
+	}
+}
+
 // Leave/Unsubscribe a topic
 func (s *Session) leave(msg *ClientComMessage) {
 	// Expand topic name