fixes Get.create() lifecycle.

Replying to an issue spotted by @Quent on Discord, this fixes the lifecycle
( `onInit()`, `onReady()`).
`onClose()` has to be called manually by the dev in the created instance.

@@ -74,3 +74,9 @@ captures/
 !.vscode/tasks.json
 !.vscode/launch.json
 !.vscode/extensions.json
+
+example/macos/Flutter/ephemeral/Flutter-Generated.xcconfig
+
+example/macos/Flutter/ephemeral/
+
+example/macos/Flutter/GeneratedPluginRegistrant.swift

@@ -159,12 +159,16 @@ class GetInstance {
   /// Optionally associating the current Route to the lifetime of the instance,
   /// if [GetConfig.smartManagement] is marked as [SmartManagement.full] or
   /// [GetConfig.keepFactory]
+  /// Only flags `isInit` if it's using `Get.create()`
+  /// (not for Singletons access).
   bool _initDependencies<S>({String name}) {
     final key = _getKey(S, name);
     final isInit = _singl[key].isInit;
     if (!isInit) {
       _startController<S>(tag: name);
+      if (_singl[key].isSingleton) {
         _singl[key].isInit = true;
+      }
       if (GetConfig.smartManagement != SmartManagement.onlyBuilder) {
         _registerRouteInstance<S>(tag: name);
       }