Possible Bug - Import entities

   Following on from this thread - the code we ended up using for our Merge method is as follows; 
            sourceRepository.Manager.FindEntities<Entity>(EntityState.Added)
                .ForEach(e =>
                                 {
                                     e.EntityAspect.AcceptChanges();
                                     e.EntityAspect.SetModified();
                                 });

            var restoreStrategy = new RestoreStrategy(false, false, MergeStrategy.OverwriteChanges);
            var data = sourceRepository.Manager.CacheStateManager.GetCacheState();
            Manager.CacheStateManager.RestoreCacheState(data, restoreStrategy);
            Manager.FindEntities<Entity>(EntityState.Modified)
                .Where(e => (int)e.EntityAspect.EntityKey.Values[0] < 0)
                .ForEach(e => e.EntityAspect.EntityState = EntityState.Added);

We have a Note entity which has a complex type Audit. After GetCacheState() the EntityCacheState preserves the state of Audit however after the call to RestoreCacheState() Audit's properties are null. 

Is this a bug with RestoreCacheState or intended behavior? Is there a way to preserve the state of Audit?