fix: use whitelisted events to identify known_events

event_routing_backends/management/commands/helpers/queued_sender.py

@@ -51,7 +51,7 @@ def is_known_event(self, event):
         """
         if "name" in event:
             for processor in self.engine.processors:
-                if event["name"] in processor.registry.mapping:
+                if event["name"] in processor.whitelist:
                     return True
         return False