Laravel migrate command always tries to create a migations table - laravel

Question

I have the following code from an Artisan command that creates a new database:
public static function run($command)
{
$command->newLine();
$command->warn('Creating main database');
DB::disconnect('mysql');
// config(['database.connections.mysql.database' => '']);
DB::reconnect('mysql');
DB::statement('CREATE DATABASE IF NOT EXISTS `db`;');
DB::disconnect('mysql');
config(['database.connections.mysql.database' => 'manager']);
DB::reconnect('mysql');
$command->info('Database created');
$command->warn('Running migrations');
$command->call('migrate', [
'--path' => 'vendor/company/database/database/manager'
]);
$command->info('All migrations have been executed');
$command->warn('Inserting default record');
DB::table('customers')
->insert([
'name' => 'Customer',
'email' => 'customer#example.com.br',
'phone' => '55999999999',
'db_password' => Crypt::encryptString('pass'),
'modules' => 'basic,banners,dispatches,conversations',
'created_at' => now(),
'updated_at' => now(),
]);
$command->info('Record successfully inserted');
$command->info('Main database sucessfully created');
$command->newLine();
}
It works perfectly, but if I uncomment the line that is commented out, it starts showing an error that the migrations table already exists. If this line is commented out, it just tells you that there are no migrations to run.
I know it's something specific to me, but I'd like to understand why this single database name change is causing this error.