fix: move ChangeScenario outside of loop, remove the discard modifier

Author: AECohn

src/PepperDash.Essentials.Core/Room/Combining/EssentialsRoomCombiner.cs

@@ -445,10 +445,10 @@ public void SetRoomCombinationScenario(string scenarioKey)
                     else
                     {
                         Debug.LogMessage(LogEventLevel.Debug, this, "Unable to find partition with key: '{0}'", partitionState.PartitionKey);
-                    }
-                    // Sets the scenario while disregarding the returned task. This prevents current scenario from being null when starting in manual mode.
-                _ = ChangeScenario(scenario);
+                    }                  
                 }
+                // Activates the scenario to prevent _currentScenario from being null when starting in manual mode.
+                ChangeScenario(scenario);
             }
             else
             {