Laravel加密字符串未按预期运行

我有以下代码:

$user = User::where('UserID', 14)->first();
$encrypted=Crypt::encryptString('MySecretPassword');
$user->smtp_password=$encrypted;
$user->save();

//This outputs the original password MySecretPassword.
dd($user->smtp_password);
//This gives payload is invalid error
$passw=Crypt::decryptString($user->smtp_password);

原始加密(Crypt::encryptString)将MySecretPassword保存为Mysql数据库中的长加密字符串。数据库数据类型为长文本。当我在不解密的情况下输出值时,它会给我原始密码形式,而不是加密的字符串(请参阅上面的代码)。为什么我看不到数据库中的加密字符串?我还没有进行任何解密。

用户模型:

namespace App;

use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use Auth;
use Crypt;

class User extends Authenticatable
{
    use Notifiable;
    
    
protected $primaryKey = 'UserID';
public $timestamps = false;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password','smtp_password',
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 
        'remember_token', 
        'driver', 
        'host', 
        'port', 
        'encryption',
        'username',
        'smtp_password'
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];
    
    
    
    public function getSmtpPasswordAttribute($value)
    {
        return Crypt::decryptString($value);
    }

    
    
public function scopeConfiguredEmail($query) {
$user = Auth::user();
return $query->where('UserID', $user->UserID);
}