Bad result in find by prefix

[prospero78]

Im call Find() by prefix. After call -- get iterator and range over iterator.
When im extract pair "key-value" -- key coping true and value replase with last item all value in result.
Im find solve for this problem: im convert []byte to string and copy to local variable. Its not good solve, and this solve work.
Please, fixit this. Thanks from Russia with avans.