Issue after Upgrading to Laravel 11: Undefined array key “driver”

I followed all the upgrade guide requirements, but when I run php artisan, I get the following error:

Undefined array key "driver"

  at vendor/laravel/framework/src/Illuminate/Filesystem/FilesystemServiceProvider.php:117
    113▕      * @return bool
    114▕      */
    115▕     protected function shouldServeFiles(array $config)
    116▕     {
  ➜ 117▕         return $config['driver'] === 'local' && ($config['serve'] ?? false);
    118▕     }
    119▕ 
    120▕     /**
    121▕      * Get the default file driver.

I checked the vendor files and found the function responsible:

/**
 * Determine if the disk is serveable.
 *
 * @param  array  $config
 * @return bool
 */
protected function shouldServeFiles(array $config)
{
    return $config['driver'] === 'local' && ($config['serve'] ?? false);
}

To debug, I dumped the $config and got:

array:3 [
  "driver" => "local"
  "root" => "/var/www/html/storage/app"
  "throw" => false
]

When I dd() the full condition, it returns false:

dd($config['driver'] === 'local' && ($config['serve'] ?? false));

If I modify the vendor file to return false, php artisan starts working again—but obviously, modifying vendor files isn’t a proper solution.

My filestems.php file

        's3' => [
            'blog' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'blog',
                'url' => env('AWS_URL').'/blog',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'verifications' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'verifications',
                'url' => env('AWS_URL').'/verifications',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'contracts' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'contracts',
                'url' => env('AWS_URL').'/contracts',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'preliminary' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'preliminary',
                'url' => env('AWS_URL').'/preliminary',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'temporary' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'temporary',
                'url' => env('AWS_URL').'/temporary',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'internal' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'internal',
                'url' => env('AWS_URL').'/internal',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'listing-images' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'listing-images',
                'url' => env('AWS_URL').'/listing-images',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'payout-invoices' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'payout-invoices',
                'url' => env('AWS_URL').'/payout-invoices',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
            'listing-payment-invoices' => [
                'driver' => 's3',
                'key' => env('AWS_ACCESS_KEY_ID'),
                'secret' => env('AWS_SECRET_ACCESS_KEY'),
                'region' => env('AWS_DEFAULT_REGION'),
                'bucket' => 'listing-payment-invoices',
                'url' => env('AWS_URL').'/listing-payment-invoices',
                'endpoint' => env('AWS_ENDPOINT'),
                'use_path_style_endpoint' => env('AWS_USE_PATH_STYLE_ENDPOINT', true),
                'throw' => true,
            ],
        ],

Has anyone encountered this issue before? Any insights on how to fix it properly?