Update conflict resolver when loading node list

lib/archethic/bootstrap/sync.ex

@@ -139,8 +139,25 @@ defmodule Archethic.Bootstrap.Sync do
   def load_node_list() do
     current_nodes = P2P.authorized_and_available_nodes()
 
+    last_updated_nodes = fn acc,
+                            new_node = %Node{
+                              first_public_key: public_key,
+                              last_update_date: update_date
+                            } ->
+      previous_node =
+        %Node{last_update_date: previous_update_date} = Map.get(acc, public_key, new_node)
+
+      node =
+        if DateTime.compare(update_date, previous_update_date) == :gt,
+          do: new_node,
+          else: previous_node
+
+      Map.put(acc, public_key, node)
+    end
+
     conflict_resolver = fn results ->
-      Enum.max_by(results, fn %NodeList{nodes: nodes} -> length(nodes) end)
+      Enum.flat_map(results, fn %NodeList{nodes: nodes} -> nodes end)
+      |> Enum.reduce(%{}, fn node, acc -> last_updated_nodes.(acc, node) end)
     end
 
     case P2P.quorum_read(current_nodes, %ListNodes{}, conflict_resolver) do