Documentation should note that OnDelete should set IsSaved to false in chapter 24.1

In chapter 24.1, an alternative way of maintaining whether an entity is transient is described. This chapter explains that by providing an IInterceptor that maintains an IsSaved flag, you can implement your own strategy for when an entity is transient.

Currently, the chapter only specifies that the OnLoad and OnSave must be used. However, when you delete an entity, it becomes transient again and the IsSaved flag should be set to false.