So I'd never stopped to consider that if a chain splits, any NFTs on that chain will exist in duplicate on the resulting forks.
So which one becomes the 'true/original NFT'? The one on the chain that wins the name (eg ETH vs ETC)? The one that ends up with more economic value? Does the minter get to decide?
I suppose that both copies would exist and hold some amount of value (whatever value an NFT holds, at least). No clear social consensus here, maybe just a case-by-case basis.
Bitcoin Maston Instance