fix UnsafeValues#loadAdvancement doesn't recalculate position (#9846)

patches/server/Fix-UnsafeValues-loadAdvancement.patch

@@ -22,7 +22,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +            mapBuilder.put(minecraftkey, holder);
 +
 +            MinecraftServer.getServer().getAdvancements().advancements = mapBuilder.build();
-+            MinecraftServer.getServer().getAdvancements().tree().addAll(List.of(holder));
++            final net.minecraft.advancements.AdvancementTree tree = MinecraftServer.getServer().getAdvancements().tree();
++            tree.addAll(List.of(holder));
++
++            // recalculate advancement position
++            final net.minecraft.advancements.AdvancementNode node = tree.get(minecraftkey);
++            if (node != null) {
++                final net.minecraft.advancements.AdvancementNode root = node.root();
++                if (root.holder().value().display().isPresent()) {
++                    net.minecraft.advancements.TreeNodePosition.run(root);
++                }
++            }
 +            // Paper end - Fix throw UnsupportedOperationException
              Advancement bukkit = Bukkit.getAdvancement(key);