API: Fix cloning events with meta data (PRETIXEU-9FZ)

src/pretix/api/serializers/event.py

@@ -424,7 +424,7 @@ class CloneEventSerializer(EventSerializer):
         new_event = super().create({**validated_data, 'plugins': None})
 
         event = Event.objects.filter(slug=self.context['event'], organizer=self.context['organizer'].pk).first()
-        new_event.copy_data_from(event)
+        new_event.copy_data_from(event, skip_meta_data='meta_data' in validated_data)
 
         if plugins is not None:
             new_event.set_active_plugins(plugins)