Example Unity Scene Bootloader w/ Local Physics

Bootloader.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;
using UnityEngine.ResourceManagement.ResourceProviders;
using UnityEngine.SceneManagement;

namespace Example
{

    public class Bootloader : MonoBehaviour
    {
        public SceneInstance AScene { get; private set; }
        public SceneInstance BScene { get; private set; }
        public SceneInstance CScene { get; private set; }
        public SceneInstance DScene { get; private set; }


        private void Awake()
        {
            if (AConstants.UseBootLoader)
                StartCoroutine(LoadScenesInOrder());
        }

        private IEnumerator LoadScenesInOrder()
        {
            List<AsyncOperationHandle<SceneInstance>> handles = new List<AsyncOperationHandle<SceneInstance>>();

            handles.Add(LoadSceneAsync("A"));
            handles.Add(LoadSceneAsync("B"));
            handles.Add(LoadSceneAsync("C"));
            handles.Add(LoadSceneAsync("D"));

            foreach (var handle in handles)
                yield return new WaitUntil(() => handle.IsDone);

            for (int i = 0; i < handles.Count; i++)
                if (handles[i].Status != AsyncOperationStatus.Succeeded)
                {
                    Debug.LogError($"Failed to load scene: {handles[i].DebugName}");
                    yield break;
                }

            foreach (var handle in handles)
                yield return handle.Result.ActivateAsync();

            AScene = handles[0].Result;
            BScene = handles[1].Result;
            CScene = handles[2].Result;
            DScene = handles[3].Result;

            //foreach (var handle in handles)
            //Addressables.Release(handle);
        }

        private static AsyncOperationHandle<SceneInstance> LoadSceneAsync(string sceneName)
        {
            LoadSceneParameters loadSceneParameters = new LoadSceneParameters(LoadSceneMode.Additive, LocalPhysicsMode.Physics3D);
            var handle = Addressables.LoadSceneAsync($"Assets/Scenes/{sceneName}.unity", loadSceneParameters, activateOnLoad: false);
            return handle;
        }
    }
}