ResourceChangeListener onChange event not getting trigger

Hi All,

the following code for onChange used to work in AEM 6.2 but after we migrated to 6.3 , I see onChange is not getting fired, not sure what is going wrong.

@Component(immediate = true)

@Service
@Properties(value = { @Property(name = ResourceChangeListener.PATHS, value = { CommunityConstants.CONTENT_ROOT_PATH }),

   @Property(name = ResourceChangeListener.CHANGES, value = { "ADDED", "CHANGED" }, propertyPrivate = true) })

public class xyz implements ResourceChangeListener {

@Reference
private ResourceResolverFactory resourceResolverFactory;

@Reference
private ContentModelService contentModelService;

@Override
public void onChange(@Nonnull List<ResourceChange> changes) {

//some logic here

}

}

Please help me to understand it further.

Many Thanks,

Kranthi