A couple of changes to scenario

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

 
         void Start()
         {
+            currentIteration = (int)genericConstants.startFrame;
+
             var randomSeedMetricDefinition = DatasetCapture.RegisterMetricDefinition(
                 "random-seed",
                 "The random seed used to initialize the random state of the simulation. Only triggered once per simulation.",

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

         /// </summary>
         [Tooltip("The starting value initializing all random value sequences generated through Samplers, Parameters, and Randomizers attached to a Scenario")]
         public uint randomSeed = SamplerUtility.largePrime;
+
+        public uint startFrame = 0;
     }
 }