dont' forget to modify your model

namespace App;

use Illuminate\Database\Eloquent\Model;
use Grimzy\LaravelMysqlSpatial\Eloquent\SpatialTrait;

/**
 * @property \Grimzy\LaravelMysqlSpatial\Types\Point   $location
 * @property \Grimzy\LaravelMysqlSpatial\Types\Polygon $area
 */
class Place extends Model
{
    use SpatialTrait;

    protected $fillable = [
        'name'
    ];

    protected $spatialFields = [
        'location',
        'area'
    ];
}

and remember that polygon array must have structure like

first_array_element == last_array_element