Unable to lerp through a list of materials?

Unity Engine
1

I have been trying to lerp through a given list of materials on both 2D and 3D objects to no avail. Unity and Visual has shown no errors with my code (which I’ll be attaching below). I found that the code is just unable too lerp through lightweight pipeline based materials. I have tested with standard materials and the code runs perfectly fine. Is there any particular reason why I cannot lerp between lightweight pipeline based materials? Is there something I’m missing that I’m not taking into account for these materials?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class ImageShift : MediaEffect {

    public GameObject target;
    public Material[] images;
    public Renderer rend;
    public Material startMat;
    public float delayTimer;
    public float delta;
    public float speakingTime;
    IEnumerator cr;
    float timer = 0.0f;
    public float tester;
    private void Start()
    {

        rend = GetComponent<Renderer>();
        StartCoroutine(Shift());
         
    }

    public override void RunShader()
    {
        Debug.Log("Running imageShift script");
        if (cr != null)
        {
            StopCoroutine(cr);
        }
        cr = Shift();
        StartCoroutine(cr);
    }

    IEnumerator Shift()
    {
        Debug.Log("Running Shift");
       

        foreach (Material img in images)
        {
            Debug.Log("Running foreach loop");
           
            timer = 0.0f;
            while (timer < 1)
            {
                tester = timer / delayTimer;

                Debug.Log("Whileloop");
                rend.material.Lerp(rend.material, img, timer/delayTimer);
                Debug.Log(tester);
                timer += delta;
                yield return new WaitForSeconds(0.5f);
            }
        }
    }
}
2

Are you expecting Material.Lerp to interpolate any of your textures?
Looking at the documentation you can see it will only interpolate colors and floats.
If you want to interpolate between textures you will need a shader that can do that.