[PlanarReflection] Fixed domain reload for realtime probes

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/ReflectionSystemInternal.cs

         {
             m_Parameters = parameters;
 
-            m_PlanarReflectionProbes = new HashSet<PlanarReflectionProbe>();
-            m_PlanarReflectionProbe_DirtyBounds = new HashSet<PlanarReflectionProbe>();
+            // Runtime collections
+            m_PlanarReflectionProbe_RealtimeUpdate_WorkArray = new PlanarReflectionProbe[parameters.maxPlanarReflectionProbes];
+
+            // Persistent collections
+            m_PlanarReflectionProbes = new HashSet<PlanarReflectionProbe>();
+            m_PlanarReflectionProbe_DirtyBounds = new HashSet<PlanarReflectionProbe>();
-            m_PlanarReflectionProbe_RealtimeUpdate_WorkArray = new PlanarReflectionProbe[parameters.maxPlanarReflectionProbes];
+                m_PlanarReflectionProbe_RequestRealtimeRender.UnionWith(previous.m_PlanarReflectionProbe_RequestRealtimeRender);
+                m_PlanarReflectionProbe_RealtimeUpdate.UnionWith(previous.m_PlanarReflectionProbe_RealtimeUpdate);
+                m_PlanarReflectionProbe_PerCamera_RealtimeUpdate.UnionWith(previous.m_PlanarReflectionProbe_PerCamera_RealtimeUpdate);
             }
         }