[CosmosDb] Child properties in inheritance hierarchy are not saved to CosmosDB

[NickSevens]

Steps to reproduce

I'm having a setup like for example:

public Context : DbContext {
  public DbSet<Animal> Animals { get; set; }
}

public class Animal {
  public string Color { get; set; }
}

public class Cat : Animal {
  public int Lives { get; set; }
}

public class Dog : Animal {
  public int Puppies { get; set; }
}

I am then adding a Cat and a Dog to my collection (_context.Animals.Add(new Dog() {...}); and _context.Animals.Add(new Cat() {...});

However, in the CosmosDb, the properties Color and Lives are not saved in the JSON document. Is there a way to allow this?

Thanks.

Further technical details

EF Core version: 3.0.0-preview9.19423.6
Database Provider: Microsoft.EntityFrameworkCore.Cosmos
Operating system: Windows 10
IDE: Visual Studio 2019

[AndriySvyryd]

@NickSevens This is not Cosmos-specific, owned types do not support inheritance