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How the attack vector would look like in case of direct transfer function in EC721 standard. It is described in the comment

A marketplace is transferring an NFT from Bob to Mary (among many other "legs" of a transaction). However, immediately before this leg, Bob sells that asset to Steve. Result: Bob is paid for sale to Steve and sale to Mary, but only Mary gets the asset.

but I still don't understand how is possible for attacker to bypass the owner check and sell NFT two times.

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