Fix ExtraProperties dictionary reference handling in mapping

framework/src/Volo.Abp.Mapperly/Volo/Abp/Mapperly/MapperlyAutoObjectMappingProvider.cs

@@ -46,7 +46,7 @@ public class MapperlyAutoObjectMappingProvider : IAutoObjectMappingProvider
         {
             mapper.BeforeMap((TSource)source);
             var destination = mapper.Map((TSource)source);
-            TryMapExtraProperties(mapper.GetType().GetSingleAttributeOrNull<MapExtraPropertiesAttribute>(), (TSource)source, destination, new ExtraPropertyDictionary());
+            TryMapExtraProperties(mapper.GetType().GetSingleAttributeOrNull<MapExtraPropertiesAttribute>(), (TSource)source, destination, GetExtraProperties(destination));
             mapper.AfterMap((TSource)source, destination);
             return destination;
         }
@@ -245,15 +245,24 @@ public class MapperlyAutoObjectMappingProvider : IAutoObjectMappingProvider
         {
             return;
         }
-        
-        MapExtraProperties<TSource, TDestination>(
-            sourceHasExtraProperties,
-            destinationHasExtraProperties,
-            destinationExtraProperty,
-            mapExtraPropertiesAttribute?.DefinitionChecks ?? MappingPropertyDefinitionChecks.Null,
-            mapExtraPropertiesAttribute?.IgnoredProperties,
-            mapExtraPropertiesAttribute?.MapToRegularProperties ?? false
-        );
+
+        if (sourceHasExtraProperties.ExtraProperties != null && sourceHasExtraProperties.ExtraProperties ==
+            destinationHasExtraProperties.ExtraProperties)
+        {
+            ObjectHelper.TrySetProperty(destinationHasExtraProperties, x => x.ExtraProperties, () => new ExtraPropertyDictionary(destinationHasExtraProperties.ExtraProperties));;
+        }
+
+        if (mapExtraPropertiesAttribute != null)
+        {
+            MapExtraProperties<TSource, TDestination>(
+                sourceHasExtraProperties,
+                destinationHasExtraProperties,
+                destinationExtraProperty,
+                mapExtraPropertiesAttribute.DefinitionChecks,
+                mapExtraPropertiesAttribute.IgnoredProperties,
+                mapExtraPropertiesAttribute.MapToRegularProperties
+            );
+        }
     }
     protected virtual void MapExtraProperties<TSource, TDestination>(
         IHasExtraProperties source,

framework/test/Volo.Abp.Mapperly.Tests/Volo/Abp/Mapperly/ExtraProperties_Dictionary_Reference_Tests.cs

@@ -96,6 +96,9 @@ public class ExtraProperties_Dictionary_Reference_Tests : AbpIntegratedTest<Mapp
         
         // Destination reference may change due to normal mapping process, but should not be same as source
         ReferenceEquals(source.ExtraProperties, destination.ExtraProperties).ShouldBeFalse();
+        
+        destination.ExtraProperties["SourceProperty"].ShouldBe("SourceValue");
+        destination.ExtraProperties["DestinationProperty"].ShouldBe("DestinationValue");
     }
 
     [Fact]