Migrations: changing key type from string to Guid results in broken migration

Original code:

public class Blog
{
    public string Id { get; set; }
}

public class Program
{
    public static void Main()
    {
    }
}

public class BloggingContext : DbContext
{
    public DbSet<Blog> Blogs { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        => optionsBuilder
            .UseSqlServer(@"Server=(localdb)\mssqllocaldb;Database=Test;ConnectRetryCount=0");
}

Initial migration:

public partial class Initial : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.CreateTable(
            name: "Blogs",
            columns: table => new
            {
                Id = table.Column<string>(nullable: false)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_Blogs", x => x.Id);
            });
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropTable(
            name: "Blogs");
    }
}

Change key type to Guid:

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

Key-change migration:

public partial class KeyChange : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<Guid>(
            name: "Id",
            table: "Blogs",
            nullable: false,
            oldClrType: typeof(string));
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<string>(
            name: "Id",
            table: "Blogs",
            nullable: false,
            oldClrType: typeof(Guid));
    }
}

Run update-database:

PM> update-database
Applying migration '20180427000202_Initial'.
Applying migration '20180427000334_KeyChange'.
Failed executing DbCommand (32ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
DECLARE @var0 sysname;
SELECT @var0 = [d].[name]
FROM [sys].[default_constraints] [d]
INNER JOIN [sys].[columns] [c] ON [d].[parent_column_id] = [c].[column_id] AND [d].[parent_object_id] = [c].[object_id]
WHERE ([d].[parent_object_id] = OBJECT_ID(N'[Blogs]') AND [c].[name] = N'Id');
IF @var0 IS NOT NULL EXEC(N'ALTER TABLE [Blogs] DROP CONSTRAINT [' + @var0 + '];');
ALTER TABLE [Blogs] ALTER COLUMN [Id] uniqueidentifier NOT NULL;
System.Data.SqlClient.SqlException (0x80131904): The object 'PK_Blogs' is dependent on column 'Id'.
ALTER TABLE ALTER COLUMN Id failed because one or more objects access this column.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
   at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
ClientConnectionId:0f72d2ce-88d6-4245-8733-05b6aa1e21b9
Error Number:5074,State:1,Class:16
The object 'PK_Blogs' is dependent on column 'Id'.
ALTER TABLE ALTER COLUMN Id failed because one or more objects access this column.

[neil-timmerman]

This is still a problem.

[ajcvickers]

After thinking/playing some more, I think a workaround could be to remove the initial migration (with Remove-Migration), make the key change, then re-create it with Add-Migration. However, I then hit this which seems to be an Identity issue.