//src/yield/YieldAccount.sol
...
//@audit YieldAcount doesn't inherit openzeppelin's ERC721Holder.sol, neither does it implement onERC721Received. Not compatible with safeMint method required by ether.fi's WithdrawRequestNFT.
contract YieldAccount is IYieldAccount, Initializable {
...

    function _safeMint(address to, uint256 tokenId, bytes memory data) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }
