array_column does not work with Entity

Hi everyone,
I have code like this:

PHP Code:

$notifications = model(NotificationSettingModel::class)->withScheduleNotification()->find($userIds);

    if (empty($notifications)) {
         return false;
    }

$users = model(UserModel::class)->find(array_column($notifications, 'user_id')); 


after running it, i got an error like this:
 

Code:

array_column(): Argument #1 ($array) must be of type array, App\Entities\NotificationSetting given

even though in version 4.4.8 the code above runs fine. but why doesn't it work on version 4.5.1?

i took an example from this repositori: 
https://github.com/lonnieezell/forum-exa...t.php#L121

Thanks All.

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