Laravel 5.8 . Why does the order of keys change, when saved to the Mysql, in the json column

Question

Why does the order of keys change, when saved to the Mysql, in the JSON column? This is the order of the keys when creating the user:

$user->emailNotifications()->create([
            'settings' =>
                [
                    "orders"        => [
                        "paid"    => false,
                        "snipped" => false,
                    ],
                    "store_actions" => [
                        "added"               => false,
                        "deleted"             => false,
                        "transferred_license" => false,
                    ],
                    "billing"       => [
                        "changed_cycle"  => false,
                        "failed_payment" => false,
                    ],
                    "products"      => [
                        "deactivated" => false,
                    ],
                ],
        ]);

but stored in the database in a different order:

"orders": {
  "paid": true,
  "snipped": true
},
"billing": {
  "changed_cycle": false,
  "failed_payment": false
},
"products": {
  "deactivated": false
},
"store_actions": {
  "added": false,
  "deleted": false,
  "transferred_license": false
}

what could be the problem?