When use assetbundle in edtor -> materials become pink. This script help to reapply shader and particle. This helpful when develop. Do not use this on production.

ReApplyShaders.cs

using UnityEngine;
using System.Collections;

public class ReApplyShaders : MonoBehaviour
{
    public Renderer[] renderers;
    public Material[] materials;
    public string[] shaders;
 
    void Awake()
    {
        renderers = GetComponentsInChildren<Renderer>(true);
    }
 
    void Start()
    {
        foreach(var rend in renderers)
        {
            materials = rend.sharedMaterials;
            shaders = new string[materials.Length];
 
            if (rend.GetComponent<ParticleSystem>() != null)
            {
                Material tempMaterial = rend.sharedMaterial;
                Shader shader = Shader.Find(rend.sharedMaterial.shader.name);
                if (shader)
                {
                    rend.sharedMaterial.shader = shader;
                    rend.sharedMaterial.renderQueue = tempMaterial.renderQueue;
                }
                continue;
            }

            for( int i = 0; i < materials.Length; i++)
            {
                shaders[i] = materials[i].shader.name;
            }        
 
            for( int i = 0; i < materials.Length; i++)
            {
                Material tempMaterial = materials[i];
                materials[i].shader = Shader.Find(shaders[i]);
                rend.sharedMaterial.renderQueue = tempMaterial.renderQueue;
            }
        }
    }
}

GameObject obj = Instantiate(somePrefab);
if (Application.isEditor)
{
obj.AddComponent<ReApplyShaders>();
}