Trying to draw sprite renderers from prefab

#if UNITY_EDITOR
using System;
#endif
using UnityEngine;

public class Test : MonoBehaviour
{
    public GameObject m_item;

#if UNITY_EDITOR
    private GameObject currentItem;
    private SpriteRenderer[] cachedRenderers;
    private GUIOps[] ops;

    private void OnDrawGizmos()
    {
        if (currentItem != m_item)
        {
            currentItem = m_item;
            cachedRenderers = null;
        }

        // Cache renderers
        if ((cachedRenderers == null || ops == null) && currentItem != null)
        {
            cachedRenderers = currentItem.GetComponentsInChildren<SpriteRenderer>(true);

            ops = new GUIOps[cachedRenderers.Length];

            for (int i = 0; i != cachedRenderers.Length; i++)
            {
                SpriteRenderer cachedRenderer = cachedRenderers[i];
                Sprite sprite = cachedRenderer.sprite;
                Texture2D croppedTexture = new Texture2D((int)sprite.textureRect.width, (int)sprite.textureRect.height, TextureFormat.ARGB32, false);
                Color[] pixels = sprite.texture.GetPixels(
                    (int)sprite.textureRect.x,
                    (int)sprite.textureRect.y,
                    (int)sprite.textureRect.width,
                    (int)sprite.textureRect.height
                );
                Array.Reverse(pixels);
                croppedTexture.SetPixels(pixels);
                croppedTexture.Apply();
                Vector3 size = Vector3.Scale(cachedRenderer.bounds.size, cachedRenderer.transform.lossyScale);
                ops[i] = new GUIOps
                {
                    screenRect = new Rect(cachedRenderer.bounds.center - (size/2), size),
                    texture = croppedTexture
                };
            }
        }

        if (ops != null)
            for (int i = 0; i != ops.Length; i++)
            {
                GUIOps op = ops[i];
                Rect rect = op.screenRect;
                rect.center += (Vector2) transform.position;
                Gizmos.DrawGUITexture(rect, op.texture);
            }
    }

    private class GUIOps
    {
        public Rect screenRect;
        public Texture2D texture;
    }
#endif
}