Where buidler-ganache has an invalid opcode bug for gelatoCore.unstakeExecutor(), hardhat has none

no-bug-on-hardhat.js

// running `npx hardhat run` automatically makes use of buidler-waffle plugin
const hre = require("hardhat");
const { ethers } = hre;
const GelatoCoreLib = require("@gelatonetwork/core");
const { sleep } = GelatoCoreLib;

(async function main() {
  if (hre.network.name !== "hardhat") {
    console.error("Test Suite is meant to be run on hardhat only");
    process.exit(1);
  }
  // ===== GELATO LOCAL SETUP ==================
  const gelatoCore = await ethers.getContractAt(
    GelatoCoreLib.GelatoCore.abi,
    hre.network.config.GelatoCore
  );

  // DEBUG: buidler-ganache INVALID OPCODE bug

  // NO BUG on hardhat

  await gelatoCore.stakeExecutor({ value: ethers.utils.parseEther("2") });

  await gelatoCore.unstakeExecutor();

  await sleep(20000);

  // DEBUG END
})();