FixUp: Collection properties incorrect

[bricelam]

class TestAssembly
{
    [Key]
    public string Name { get; set; }
    public ICollection<TestClass> Classes { get; } = new List<TestClass>();
}

class TestClass
{
    public TestAssembly Assembly { get; set; }
    public string Name { get; set; }
}

class Context : DbContext
{
    public DbSet<TestAssembly> Assemblies { get; set; }
    public DbSet<TestClass> Classes { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder options)
        => options.UseSqlite("Data Source=ConsoleApplication1.db");

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<TestClass>(
            x =>
            {
                x.Property<string>("AssemblyName");
                x.HasKey("AssemblyName", nameof(TestClass.Name));
                x.HasOne(c => c.Assembly).WithMany(a => a.Classes)
                    .HasForeignKey("AssemblyName");
            });
    }
}

class Program
{
    static void Main()
    {
        using (var db = new Context())
        {
            db.Database.EnsureDeleted();
            db.Database.EnsureCreated();

            // Seed the database
            var assembly = new TestAssembly { Name = "Assembly1" };
            db.Classes.Add(new TestClass { Assembly = assembly, Name = "Class1" });
            db.Classes.Add(new TestClass { Assembly = assembly, Name = "Class2" });
            db.SaveChanges();
        }

        using (var db = new Context())
        {
            db.Classes.Include(c => c.Assembly).Load();
            var assembly = db.ChangeTracker.Entries<TestAssembly>().Select(e => e.Entity)
                .Single();

            // Fails with "count was 1"
            var count = assembly.Classes.Count;
            Debug.Assert(count == 2, "count was " + count);
        }
    }
}