withdrawExit method can be used to exit the withdraw process by using the txHash from
const erc721RootToken = posClient.erc721(<root token address>, true);
const result = await erc721RootToken.withdrawExit(<burn tx hash>);
const txHash = await result.getTransactionHash();
const txReceipt = await result.getReceipt();
This method does multiple RPC calls to generate the proof and process exit. So it is recommended to use withdrawExitFaster method.