randomizers now reference the current scenario through the static activeScenario property

com.unity.perception/Runtime/Randomization/Randomizers/Randomizer.cs

     public abstract class Randomizer
     {
         bool m_PreviouslyEnabled;
-        // ReSharper disable once InconsistentNaming
-        ScenarioBase m_Scenario;
-        // ReSharper disable once InconsistentNaming
-        RandomizerTagManager m_TagManager;
 
         [HideInInspector, SerializeField] internal bool collapsed;
 
         /// <summary>
         /// Returns the scenario containing this Randomizer
         /// </summary>
-        public ScenarioBase scenario => m_Scenario;
+        public ScenarioBase scenario => ScenarioBase.activeScenario;
-        public RandomizerTagManager tagManager => m_TagManager;
+        public RandomizerTagManager tagManager => scenario.tagManager;
 
         internal IEnumerable<Parameter> parameters
         {
         /// OnUpdate is executed every frame for enabled Randomizers
         /// </summary>
         protected virtual void OnUpdate() { }
-
-        internal void Initialize(ScenarioBase parentScenario, RandomizerTagManager parentTagManager)
-        {
-            m_Scenario = parentScenario;
-            m_TagManager = parentTagManager;
-        }
 
         internal virtual void Create()
         {

com.unity.perception/Runtime/Randomization/Scenarios/ScenarioBase.cs

             activeScenario = this;
             OnAwake();
             foreach (var randomizer in m_Randomizers)
-                randomizer.Initialize(this, tagManager);
-            foreach (var randomizer in m_Randomizers)
                 randomizer.Create();
             ValidateParameters();
 
                         $"Two Randomizers of the same type ({randomizerType.Name}) cannot both be active simultaneously");
             var newRandomizer = (Randomizer)Activator.CreateInstance(randomizerType);
             m_Randomizers.Add(newRandomizer);
-            newRandomizer.Initialize(this, tagManager);
             newRandomizer.Create();
             return newRandomizer;
         }