Fix a bug of entity version updating in `ExternalEntitySynchronizer`

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/Events/Distributed/ExternalEntitySynchronizer.cs

@@ -114,8 +114,11 @@ public abstract class ExternalEntitySynchronizer<TEntity, TExternalEntityEto> :
         }
         else
         {
+            // The version will auto-increment by one when the repository updates the entity.
+            var entityVersion = eto.EntityVersion - 1;
+
             await MapToEntityAsync(eto, localEntity);
-            ObjectHelper.TrySetProperty(localEntity, x => x.EntityVersion, () => eto.EntityVersion);
+            ObjectHelper.TrySetProperty(localEntity, x => x.EntityVersion, () => entityVersion);
 
             await _repository.UpdateAsync(localEntity, true);
         }

framework/test/Volo.Abp.Ddd.Tests/Volo/Abp/Domain/Entities/Events/Distributed/ExternalEntitySynchronizers/ExternalEntitySynchronizer_Tests.cs

@@ -60,7 +60,7 @@ public class ExternalEntitySynchronizer_Tests : AbpIntegratedTest<ExternalEntity
 
         var book = await repository.FindAsync(bookId);
         book.ShouldNotBeNull();
-        book.EntityVersion.ShouldBe(remoteBookEto.EntityVersion);
+        book.EntityVersion.ShouldBe(0);
         book.Sold.ShouldBe(1);
 
         remoteBookEto.EntityVersion = 1;
@@ -70,7 +70,7 @@ public class ExternalEntitySynchronizer_Tests : AbpIntegratedTest<ExternalEntity
 
         book = await repository.FindAsync(bookId);
         book.ShouldNotBeNull();
-        book.EntityVersion.ShouldBe(remoteBookEto.EntityVersion);
+        book.EntityVersion.ShouldBe(1);
         book.Sold.ShouldBe(2);
 
         remoteBookEto.EntityVersion = 0;