call onUpdate on initial load

Author: jkebinger

src/prefab.ts

@@ -230,14 +230,14 @@ class Prefab implements PrefabInterface {
       this.updateIfStalerThan.bind(this),
       this.telemetry,
       undefined,
-      () => {},
+      () => {}, // Start with no-op to avoid premature updates
       defaultContext,
       this.globalContext
     );
 
     this.configChangeNotifier.init(tempResolver);
 
-    // Define the actual combined onUpdate callback
+    // Now that notifier is initialized, set up the actual update callback
     const actualCombinedOnUpdate = (
       updatedConfigs: Array<Config | MinimumConfig>
     ): void => {
@@ -246,9 +246,11 @@ class Prefab implements PrefabInterface {
     };
 
     tempResolver.setOnUpdate(actualCombinedOnUpdate);
-
-    // Assign the fully configured resolver to the Prefab instance
     this.resolver = tempResolver;
+
+    if (configs.length > 0) {
+      actualCombinedOnUpdate(configs);
+    }
   }
 
   async init({