Its better to think of NFTs as limited edition merch instead of ownership of the work.
I guess it‘s some form of „trust“ between the issuer and the buyer.
Or the 2nd NFT wouldn‘t be as memey anymore and thus not worth as much.
(It would probably be worth more the first time in reality, since issuing an NFT twice is not „supposed to happen“, so there would be some novelty to it, and I guess novelty is part of what drives the prices. See also Banksy‘s image that actually increased in value after it got publicly shredded by a built-in mechanism after being auctioned off.)