Laravel 5.4 - instanceof Collection not returning true when being passed what seems to be a Collection

I'm working with a method that does an instanceof Collection check:

if ($group instanceof Collection) {
    $group = $group->pluck('name');
}

This is being used in many places, so I am not able to change it (not that I want to), but I do want to pass in a collection of group names. I'm instantiating my collection like so:

$group = collect(['one', 'two', 'three']);

When I dd the $group variable it looks a duck,

Collection {#612
  #items: array:3 [
    0 => "one"
    1 => "two"
    2 => "three"
  ]
}

but returns false in that instanceof check. Any ideas why this might be so?

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