Add-Migration error with EF Core Owned type

I have two "owned" types referenced from ApplicationUser (which inherits from IdentityUser):

using System;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;

namespace OwnedEntityTest.Data
{
    public class ApplicationUser : IdentityUser
    {
        public PersonalName Name { get; set; }
        public ValidationToken ValidationToken { get; set; }
    }

    [Owned]
    public class PersonalName
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    [Owned]
    public class ValidationToken
    {
        public int ValidationCode { get; set; }
        public DateTime ExperiationDateUTC { get; set; }
    }
}

When I add a new migration, the scaffolder complains:

Cannot use table 'IdentityUser' for entity type 'ValidationToken' since it is being used for entity type 'PersonalName' and there is no relationship between their primary keys.

Is this just a bug, or am I doing something subtly wrong (or not understanding something about owned types)?

Yes, you can recreate this problem:

1. Create a new project from the ASP.NET Core Web Application project template
2. Select Web Application
3. Click Change Authentication and select Individual user accounts
4. In Package Manager Console, enter update-database to update the model snapshot.
5. Add the above code to the project
6. In ApplicationDbContext, add the reference to ApplicationUsers:
   public DbSet<ApplicationUser> ApplicationUsers { get; set; }
7. Add a new migration in Package Manager Console:
   add-migration m_001
8. Ta dah... you should see the error message

EDIT:

Microsoft has confirmed that this is a bug.