Why does not work except in collection Laravel?

I have the following code:

  $object = Object::with("prototypes.fields")->findOrFail($id)->get();

  $object_copied = $object->except(['id', 'prefix', 'prototypes']);

  dd($object_copied->all());

Last line returns collection with fields that should be except: 'id', 'prefix', 'prototypes'

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