Update

Assets/Invector-3rdPersonController/Basic Locomotion/Scripts/Generic/Triggers/vLoadLevelHelper.cs

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+using Invector.vCharacterController;
+using System.Collections;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace Invector.Utils
+{
+    public interface vISceneLoadListener
+    {
+        void OnStartLoadScene(string sceneName);
+        void OnFinishLoadScene(string sceneName);
+    }
+
+    public static class LoadLevelHelper
+    {
+        public static vThirdPersonInput targetCharacter;
+        public static string spawnPointName;
+        public static string sceneName;
+        public static bool isLoading;
+        public static void LoadScene(string _sceneName, string _spawnPointName, vThirdPersonInput tpInput)
+        {
+            if (!tpInput) return;
+            targetCharacter = tpInput;
+            spawnPointName = _spawnPointName;
+            sceneName = _sceneName;
+
+            if (targetCharacter.tpCamera)
+            {
+                targetCharacter.tpCamera.transform.parent = targetCharacter.transform;
+            }
+
+            var listeners = targetCharacter.GetComponents<vISceneLoadListener>();
+            foreach (var listener in listeners)
+            {
+                listener.OnStartLoadScene(_sceneName);
+            }
+
+            targetCharacter.StartCoroutine(LoadAsyncScene());
+        }
+
+        static IEnumerator LoadAsyncScene()
+        {           
+            // Ensure targetCharacter is still valid
+            if (targetCharacter == null|| isLoading) yield break;
+
+            isLoading = true;
+            Scene currentScene = SceneManager.GetActiveScene();
+            if (!currentScene.name.Equals(sceneName))
+            {
+                SceneManager.sceneUnloaded += OnSceneUnloaded;
+
+                AsyncOperation asyncLoad = SceneManager.LoadSceneAsync(sceneName, LoadSceneMode.Additive);
+
+                while (!asyncLoad.isDone)
+                {
+                    yield return null;
+                }
+
+                SceneManager.MoveGameObjectToScene(targetCharacter.gameObject, SceneManager.GetSceneByName(sceneName));
+                SceneManager.UnloadSceneAsync(currentScene);
+            }
+            else
+            {
+                MoveCharacterToSpawnPoint();
+            }
+            isLoading = false;
+        }
+
+        static void OnSceneUnloaded(Scene unloadedScene)
+        {
+            var listeners = targetCharacter.GetComponents<vISceneLoadListener>();
+            foreach (var listener in listeners)
+            {
+                listener.OnFinishLoadScene(unloadedScene.name);
+            }
+            MoveCharacterToSpawnPoint();
+            SceneManager.sceneUnloaded -= OnSceneUnloaded;
+        }
+
+        static void MoveCharacterToSpawnPoint()
+        {
+            var spawnPoint = GameObject.Find(spawnPointName);
+
+            if (spawnPoint && targetCharacter)
+            {
+                targetCharacter.lockCameraInput = true;
+
+                if (targetCharacter.tpCamera)
+                {
+                    targetCharacter.tpCamera.FreezeCamera();
+                }
+
+                targetCharacter.transform.position = spawnPoint.transform.position;
+                targetCharacter.transform.rotation = spawnPoint.transform.rotation;
+
+                if (targetCharacter.tpCamera)
+                {
+                    targetCharacter.tpCamera.transform.parent = null;
+                    targetCharacter.tpCamera.UnFreezeCamera();
+                }
+
+                targetCharacter.lockCameraInput = false;
+            }
+        }
+    }
+}