TPT: Additional migrations drop base entity columns from derived entity table

[eraffel-MDSol]

Basically the title. Not sure if I'm wiring up TPT correctly, but If I create a model using TPT with base and derived classes, the first migration is what I'd expect, creating the tables. If I add a second migration, it tries to drop the columns on the base table from the table for the derived class.

Sidenote; I'm using the 3.1.6 EF Core tools (dotnet-ef), so if that might be it, let me know.

Steps to reproduce

1. Create an app with following DbContext, and the latest preview or daily EF packages (I've tested on 5.0.0-preview.8.20365.2 and 5.0.0-rc.1.20406.1)
2. Add the initial migration.
3. Add another migration

The second migration will try to drop BaseName from the Parent table

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

            modelBuilder.Entity<Parent>().ToTable("Parent");
            modelBuilder.Entity<ParentBase>().ToTable("ParentBase").HasKey(a => a.Id);
        }

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

    public abstract class ParentBase
    {
        public virtual Guid Id { get; set; }

        public string BaseName { get; set; }
    }

    public class Parent : ParentBase
    {
        public string Name { 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

[eraffel-MDSol]

just checked the latest nuget package package. looks good! Thanks!