Normalize the object only after ensuring the activity type is Create

lib/pleroma/conversation.ex

@@ -47,8 +47,8 @@ def get_for_ap_id(ap_id) do
   """
   def create_or_bump_for(activity) do
     with true <- Pleroma.Web.ActivityPub.Visibility.is_direct?(activity),
-         object <- Pleroma.Object.normalize(activity),
          "Create" <- activity.data["type"],
+         object <- Pleroma.Object.normalize(activity),
          "Note" <- object.data["type"],
          ap_id when is_binary(ap_id) and byte_size(ap_id) > 0 <- object.data["context"] do
       {:ok, conversation} = create_for_ap_id(ap_id)