Notification no works

Hello,

The notification system no work.

I look and i see that the default settings is

$defaults = [
      'enabled'      => 'no',
      'notify_email' => '{site_admin}',
      'notify_days'  => ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
];

And you str_replace with
$sendTo = str_replace('{admin_email}', get_option('admin_email'), $sendTo);

So the is_email return empty $sendToArray

admin_email or site_admin maybe let admin_email like the get_option ?

Thank you