TPT: Relationships to derived type have FK to Key column on base table

[eraffel-MDSol]

If I have an class in a one-to-one relationship with a TPT derived class, when I generate the migrations, the FK is to the Key column on the base class, rather than the derived class. I understand this will work (especially along with #21943), and that it makes sense because that property belongs to the base CLR class, but I would think it would be more ideal to have the FK to the Key column on the derived table.

Steps to reproduce

Generate a migration for the following context and models

    public class MyContext : DbContext
    {
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            modelBuilder.Entity<Parent>().ToTable("Parent");
            modelBuilder.Entity<ParentBase>().ToTable("ParentBase");
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            base.OnConfiguring(optionsBuilder);
            optionsBuilder.UseSqlServer("Server=localhost;Database=Test;Trusted_Connection=True;");
        }
    }

    public abstract class ParentBase
    {
        [Key]
        public Guid Id { get; set; }

        public string BaseName { get; set; }
    }

    public class Parent : ParentBase
    {
        public string Name { get; set; }

        public ParentThing Thing { get; set; }
    }

    public class ParentThing
    {
        public Guid Id { get; set; }

        public Guid ParentId { get; set; }

        public Parent Parent { get; set; }

        public string ThingName { get; set; }
    }

Further technical details

EF Core version: 5.0.0-rc.1.20406.1
Database provider: Microsoft.EntityFrameworkCore.SqlServer
Target framework: NET Core 3.1
Operating system: Windows 10
IDE: Visual Studio 2019 16.6.5