Unity Editor Script to help cleaning up missing script references on gameobjects

CleanupMissingScripts.cs

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

public class CleanupMissingScriptsHelper{
    [MenuItem("Edit/Cleanup Missing Scripts")]
    static void CleanupMissingScripts() {
        for (int i = 0; i < Selection.gameObjects.Length; i++) {
            var gameObject = Selection.gameObjects[i];

            // We must use the GetComponents array to actually detect missing components
            var components = gameObject.GetComponents<Component>();

            // Create a serialized object so that we can edit the component list
            var serializedObject = new SerializedObject(gameObject);
            // Find the component list property
            var prop = serializedObject.FindProperty("m_Component");

            // Track how many components we've removed
            int r = 0;

            // Iterate over all components
            for (int j = 0; j < components.Length; j++) {
                // Check if the ref is null
                if (components[j] == null) {
                    // If so, remove from the serialized component array
                    prop.DeleteArrayElementAtIndex(j - r);
                    // Increment removed count
                    r++;
                }
            }

            // Apply our changes to the game object
            serializedObject.ApplyModifiedProperties();
        }
    }


    [MenuItem("Edit/Recursive Cleanup Missing Scripts")]
    static void RecursiveCleanupMissingScripts() {
        Transform[] allTransforms = Selection.gameObjects[0].GetComponentsInChildren<Transform>(true);

        for (int i = 0; i < allTransforms.Length; i++) {
            var gameObject = allTransforms[i].gameObject;

            // We must use the GetComponents array to actually detect missing components
            var components = gameObject.GetComponents<Component>();

            // Create a serialized object so that we can edit the component list
            var serializedObject = new SerializedObject(gameObject);
            // Find the component list property
            var prop = serializedObject.FindProperty("m_Component");

            // Track how many components we've removed
            int r = 0;

            // Iterate over all components
            for (int j = 0; j < components.Length; j++) {
                // Check if the ref is null
                if (components[j] == null) {
                    // If so, remove from the serialized component array
                    prop.DeleteArrayElementAtIndex(j - r);
                    // Increment removed count
                    r++;
                }
            }


            // Apply our changes to the game object
            serializedObject.ApplyModifiedProperties();
        }
    }
}

Unity 2020 -
It is not allowed to modify the data property
UnityEditor.SerializedProperty:DeleteArrayElementAtIndex (int)
CleanupMissingScriptsHelper:CleanupMissingScripts () (at Assets/Game/Scripts/AnriStudio/CleanupMissingScriptsHelper.cs:33)

Turns out unity has a method that does exactly that, I forked and edited the code and it works