TPT issues update command when replacing dependent with derived

[smitpatel]

Test - TPTTableSplittingTestBase.Can_change_dependent_instance_non_derived

Vehicle -> Operator both are mapped to Vehicles
LicensedOperator is mapped to LicensedOperators

var bike = context.Vehicles.Include(v => v.Operator).Single(v => v.Name == "Trek Pro Fit Madone 6 Series");
// bike.Operator is of type Operator with Name "Lance Armstrong"
bike.Operator = new Operator { Name = "Chris Horner" };

context.ChangeTracker.DetectChanges();

bike.Operator = new LicensedOperator { Name = "repairman", LicenseType = "Repair" };

TestSqlLoggerFactory.Clear();
context.SaveChanges();

Issues following commands in update pipeline

exec sp_executesql N'SET NOCOUNT ON;
UPDATE [Vehicles] SET [Operator_Name] = @p0
WHERE [Name] = @p1;
SELECT [RequiredInt]
FROM [Vehicles]
WHERE @@ROWCOUNT = 1 AND [Name] = @p1;

',N'@p1 nvarchar(450),@p0 nvarchar(4000)',@p1=N'Trek Pro Fit Madone 6 Series',@p0=N'repairman'

exec sp_executesql N'SET NOCOUNT ON;
UPDATE [LicensedOperators] SET [LicenseType] = @p2
WHERE [VehicleName] = @p3;
SELECT @@ROWCOUNT;

',N'@p3 nvarchar(450),@p2 nvarchar(4000)',@p3=N'Trek Pro Fit Madone 6 Series',@p2=N'Repair'

2nd fails because it should add a new row not update.

[smitpatel]

Skipped 2 more tests.
3rd test is not issuing delete command on derived table.