Submitted by k, also found by 0x29A, 0xf15ers, 0xsanson, antonttc, hyh, PwnedNoMore, and zzzitron
If an NFT is sold that does not specify support for the ERC-721 or ERC-1155 standard interface, the sale will still succeed. In doing so, the seller will receive funds from the buyer, but the buyer will not receive any NFT from the seller. This could happen in the following cases:
https://gist.github.com/kylriley/3bf0e03d79b3d62dd5a9224ca00c4cb9
If neither the ERC-721 nor the ERC-1155 interface is supported the function should revert. An alternative approach would be to attempt a transferFrom and check the balance before and after to ensure that it succeeded.
nneverlander (Infinity) confirmed and resolved:
HardlyDifficult (judge) commented:
