FindMissingReferencesInProject.cs

[MenuItem("Edit/Search missing references in prefabs (Full project)", false, 50)]
    public static void FindMissingReferencesInProject()
    {
        UnityEngine.Debug.Log("Starting search for missing components in project prefabs");
        var paths = AssetDatabase.FindAssets("t:prefab").ToList().Select(guid => AssetDatabase.GUIDToAssetPath(guid));
        foreach (var path in paths)
        {
            var go = AssetDatabase.LoadAssetAtPath<GameObject>(path);

            var components = go.GetComponents<Component>();
            var componentsChilds = go.GetComponentsInChildren<Component>();
            int array1OriginalLength = components.Length;
            Array.Resize<Component>(ref components, array1OriginalLength + componentsChilds.Length);
            Array.Copy(componentsChilds, 0, components, array1OriginalLength, componentsChilds.Length);

            foreach (var component in components)
            {
                if (component == null)
                {
                    UnityEngine.Debug.LogError("MISSING COMPONENT: " + path);
                    break;
                }
            }

        }
        UnityEngine.Debug.Log("Search completed");

    }

This editor script for Unity locates all prefabs in the project that has a missing reference and output the path in the console