EFCore cli generate a useless migration

I have a migration that create a column in a table.

public partial class AddName : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AddColumn<string>(
            name: "Name",
            table: "MyTable",
            nullable: false,
            defaultValue: "Value 1");
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropColumn(
            name: "Name",
            table: "MyTable");
    }
}

I update my database with it. And I generate a new migration. This last should be empty but it contains an useless AlterColumn.

public partial class Test : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<string>(
            name: "Name",
            table: "MyTable",
            nullable: false,
            defaultValue: "Value 1",
            oldClrType: typeof(string),
            oldType: "nvarchar(max)");
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.AlterColumn<string>(
            name: "Name",
            table: "MyTable",
            type: "nvarchar(max)",
            nullable: false,
            oldClrType: typeof(string),
            oldDefaultValue: "Value 1");
    }
}

To generate this migrations and update database, I use dotnet-ef cli.

I check it and I find no difference between two migrations. When I update database with Test migration, no changes are applied to table. I also test to update my database to a migration prior to AddName and create it again. But I have same result. Second migration stay fill with AlterColumn.

Someone already has this strange behavior?